Digital PDFs

EK-TF857-OM-002

March 1991

79 pages

Original

0.7MB

Document:	Tx857 Series Magazine Tape Subsystem Owner's Manual
Order Number:	EK-TF857-OM
Revision:	002
Pages:	79
Original Filename:

OCR Text

Educational Services

Tx857 Series
Magazine Tape Subsystem
Owner’s Manual
EK–TF857–OM–002

Digital Equipment Corporation

First Edition, March 1991
Second Edition, November 1991
The information in this document is subject to change without notice and should not
be construed as a commitment by Digital Equipment Corporation. Digital Equipment
Corporation assumes no responsibility for any errors that may appear in this document.
Copyright © Digital Equipment Corporation 1991
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual generates, uses, and may emit
radio frequency energy. The equipment has been type tested and found to comply with
the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC
Rules, which are designed to provide reasonable protection against such radio frequency
interference when operated in a commercial environment. Operation of this equipment in
a residential area may cause interference, in which case the user at his own expense may
be required to take measures to correct the interference.
The following are trademarks of Digital Equipment Corporation: BASIC, CompacTape,
DECdirect, DECmailer, DECservice, DSSI, InfoServer, KFQSA, MicroVAX, MicroVAX II,
SERVICenter, TF, TK, TZ, VAX, VAX 4000, VAX 6000, VAXserver, VMS, and the DIGITAL
logo.

Contents
Preface
1

Overview

1.1
1.2
1.3
1.4
1.5
1.5.1
1.5.2
1.5.3
1.5.4
1.5.5
1.6
1.7
1.8

vii

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Node ID Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loader Transfer Assembly . . . . . . . . . . . . . . . . . . . . . . . . .
Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TK85 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CompacTape III Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplies and Related Documents . . . . . . . . . . . . . . . . . . . . . .

1–1
1–3
1–4
1–7
1–9
1–9
1–11
1–11
1–11
1–11
1–12
1–14
1–16

Operation

2.1
2.2
2.2.1
2.2.2
2.3
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.5
2.5.1
2.5.2

Power-On Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Mode Select Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Slot Select, Load/Unload, and Eject Button Functions . . . . . . 2–6
Selecting a Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
Loading the Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
Unloading the Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
Opening the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
Inserting a Cartridge into the Front of the Magazine . . . . 2–8
Removing a Cartridge from the Magazine . . . . . . . . . . . . . 2–11
iii

iv Contents

2.5.3
2.5.4

TF857 Local Programs

3.1
3.1.1
3.2
3.3
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
3.5
3.6
3.7

Removing the Magazine from the Receiver . . . . . . . . . . . . 2–11
Installing the Magazine into the Receiver . . . . . . . . . . . . . 2–11

Accessing Local Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Error Message after Executing SET HOST/DUP Command 3–3
DIRECT Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
HISTRY Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
PARAMS Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
Displaying, Setting, and Saving Parameters . . . . . . . . . . . 3–6
HELP Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
SHOW Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
SET Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
STATUS Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
WRITE Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9
EXIT Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9
DRVEXR Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
DRVTST Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
LDRTST Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–11

Error Conditions and Problem Resolutions

4.1
Conditions Necessary for Button Operation . . . . . . . . . . . . . .
4.2
Backup Operation Failure . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3
Avoiding Basic Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1
Magazine Fault Description . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1.1
Clearing a Magazine Fault . . . . . . . . . . . . . . . . . . . . . . .
4.4.2
Loader Fault Description . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.2.1
Clearing a Loader Fault . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
Power Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1
4–3
4–3
4–4
4–5
4–5
4–6
4–6
4–6

Contents v

Head Cleaning

5.1
Accessing the Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6
5.1.1
Loading the CleaningTape III Cartridge into the Drive . . . 5–9
5.1.2
Securing the Tx857 Magazine Tape Subsystem . . . . . . . . . 5–9
5.2
Inserting the CleaningTape III Cartridge into the Magazine . 5–11

VMS Operating System Commands

A.1 Tape Device Specific Commands . . . . . . . . . . . . . . . . . . . . . .
A.1.1
ALLOCATE Command . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.2
DEALLOCATE Command . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.3
BACKUP Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.4
MOUNT Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.5
COPY Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.6
DISMOUNT Command . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.7
INITIALIZE Command . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Offerings

B.1
B.2
B.3
B.4
B.5
B.6

On-Site Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BASIC Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECservice Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carry-In Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECmailer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Per Call Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–1
A–2
A–2
A–2
A–3
A–4
A–4
A–5

B–1
B–1
B–1
B–2
B–2
B–2

Index
Figures
1–1
1–2
1–3
1–4
1–5
1–6
2–1

Front View of the Tx857 Magazine Tape Subsystem . . . . . . . 1–2
SF200 Storage Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
SF100/SZ100 Storage Array . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Tx857 Subsystem Mode Select Key Symbols . . . . . . . . . . . . . 1–8
Tx857 Magazine Tape Subsystem Block Diagram . . . . . . . . . 1–10
CompacTape III Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–12
Tx857 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . 2–3

vi Contents

2–2
2–3
2–4
2–5
4–1
5–1
5–2
5–3
5–4
5–5
5–6

Write-Protect Switch on a Cartridge . . . . . . . . . . . . . . . . . . .
Inserting a Cartridge into the Magazine . . . . . . . . . . . . . . . .
Removing a Cartridge from the Front of the Magazine . . . . .
Receiver Opened . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening the Cartridge Door to Check the Tape Leader . . . . .
CleaningTape III Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tx857 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
Sliding the Tx857 Subsystem Toward You . . . . . . . . . . . . . . .
Loader Open Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–9
2–10
2–12
2–13
4–4
5–2
5–4
5–5
5–7
5–8
5–10

Tables
1–1
1–2
1–3
1–4
1–5
2–1
3–1
3–2
4–1

Read/Write Cartridge Compatibility with the TK85 Drive . . .
Tx857 Magazine Tape Subsystem Specifications . . . . . . . . . .
TK85 Tape Drive Specifications . . . . . . . . . . . . . . . . . . . . . . .
Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tx857 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
TF857 Subsystem Parameters . . . . . . . . . . . . . . . . . . . . . . . .
TF857 PARAMS Commands . . . . . . . . . . . . . . . . . . . . . . . . .
Tx857 OCP Button Conditions . . . . . . . . . . . . . . . . . . . . . . . .

1–13
1–14
1–15
1–16
1–16
2–4
3–5
3–6
4–2

Preface
Purpose
This manual introduces the Tx857 series of magazine tape subsystems
and describes operating procedures.

Manual Structure
Chapter 1, Overview, provides a basic product description of and
specifications for the Tx857 series magazine tape subsystem.
Chapter 2, Operation, describes the power-on process, the keys and
indicators on the operator control panel (OCP), the operating modes
of the Mode Select key, and the magazine and cartridge removal and
replacement processes.
Chapter 3, TF857 Local Programs, describes how to access local diagnostic
programs on the TF857 subsystem using the SET HOST/DUP command.
Chapter 4, Error Conditions and Problem Resolutions, describes the
necessary conditions to use OCP buttons, backup operation failures, error
indications, and power problems.
Chapter 5, Head Cleaning, describes how to clean the read/write heads in
the tape drive.
Appendix A, VMS Operating System Commands, describes VMS
commands used with tape devices.
Appendix B, Service Offerings, describes maintenance plans offered by
Digital Services.

Intended Audience
This manual is intended for the TF857 or TZ857 subsystem owner.
This manual is for use by system managers, computer operators, or
anyone who uses magazine tape subsystems. Prior knowledge of and
experience with the VMS operating system and commands and tape
devices are required.

vii

viii Preface

Conventions
The term Tx857 refers to the TF857 and the TZ857 magazine tape
subsystems.
The term OCP pushbuttons refers to the Eject, Load/Unload, and Slot
Select buttons that are at the top of the operator control panel (OCP) on
the Tx857 subsystem.

1
Overview
This chapter describes the Tx857 magazine tape subsystem and its
functions.

1.1 General Description
The Tx857 magazine tape subsystem (Figure 1–1) is an electromechanical
device that can store approximately 18.2 gigabytes of data. Using
CompacTape III cartridges, the Tx857 subsystem can store up to 2.6
gigabytes of data per cartridge.
The Tx857 magazine tape subsystem can load and unload tape cartridges
into and from a tape drive, providing a degree of unattended backup,
as well as perform single cartridge operations. The Tx857 subsystem
performs automatic, sequential tape operations.
In addition, the Tx857 subsystem executes operating system commands,
qualifiers, and parameters to store data from user disk areas to the tape
drive.

1–1

1–2 Overview

Figure 1–1 Front View of the Tx857 Magazine Tape Subsystem

O PERAT O R CO NT RO L PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL
(TF857 ONLY)

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025E_91

Overview 1–3

1.2 Configuration
The Tx857 magazine tape subsystem is configured on VAX systems, and
can serve two systems as a dual-ported subsystem.
The Tx857 subsystem is available in two variations for use on systems
with a DSSI bus or a SCSI bus:
Subsystem Variation

System Bus

TF857

DSSI

TZ857

SCSI

The DSSI bus and the SCSI bus are electrical connections that allow the
system’s central processing unit (CPU) and main memory to communicate
with devices such as the TF857 and TZ857 subsystem.
The TF857 subsystem installs in both the SF200 and SF100 storage
arrays:
•

The SF200 can contain a maximum of two TF857 subsystems
(Figure 1–2). The first TF857 subsystem installs in position 5; a
second TF857 subsystem installs in position 6.

•

The SF100 (Figure 1–3) contains one factory-installed TF857
subsystem in the upper compartment; the lower compartment is
optional storage space that can contain an SF72 storage enclosure.

The TZ857 subsystem installs in the SZ100 (Figure 1–3). The
SZ100 contains one factory-installed TZ857 subsystem in the upper
compartment; the lower compartment is optional storage space that can
contain a SCSI storage device.
The TF857 is supported by version 5.4.2 or later of the VMS operating
system, the TZ857 by version 5.4.3 or later.

1–4 Overview

PERFORMANCE CONSIDERATION
The VMS backup performance rate of your Tx857 subsystem can
depend on your system processor. For example:
•

Connecting directly to an embedded bus adapter on such
systems as the VAX 4000, VAX 6000, or InfoServer 150 (TZ857
only) provides optimum performance.

•

Connecting to a MicroVAX/VAXserver 3xxx (Q–bus) system can
reduce the rate of performance but does not limit the high
capacity of data storage that your Tx857 has.

REQUIRED LOAD DEVICE
The TF857, when connected to a KFQSA adapter installed in
a MicroVAX II or MicroVAX/VAXserver 3xxx system, does not
support booting of VMS or MicroVAX Diagnostic Monitor (MDM)
software. An additional load device is needed to boot this
software.
CAUTION
The Tx857 magazine tape subsystem is not customer-installable.
Do not install it yourself or the product warranty will be void.

1.3 Node ID Label
The operator control panel on the TF857 subsystem has a space for a
DSSI node ID label (Figure 1–1), which identifies the device bus ID
number. (This label is in the label kit.) The DSSI node ID is preset
during manufacturing to zero (0). The Digital Services engineer verifies
this setting during installation at the site.
TZ857 users may wish to use this space on the operator control panel to
place a label noting the device’s SCSI ID.

Overview 1–5

Figure 1–2 SF200 Storage Array

POSITION 5
0

POSITION 6

6
3

CXO-2461B
SHR_X1106A_89

1–6 Overview

Figure 1–3 SF100/SZ100 Storage Array

TX857
Subsystem

Optional
Storage
Space

SHR-X0175_91-DG

Overview 1–7

1.4 Operating Modes
The Tx857 subsystem operates in the following modes:
•

OCP Disabled mode — Locks the subsystem into the enclosure and
locks the receiver. The pushbuttons on the operator control panel
(OCP)—Eject, Load/Unload, Slot Select—are disabled. This mode
automatically loads the next tape cartridge into the drive after you
issue the DISMOUNT command.

•

Automatic mode — Is the subsystem’s default, or normal, mode.
It locks the subsystem into the enclosure but leaves the receiver
unlocked. This mode automatically loads the next tape cartridge
into the drive after you issue the DISMOUNT command. The OCP
pushbuttons remain enabled.

•

Manual mode — Locks the subsystem into the enclosure but
leaves the receiver unlocked. This mode allows for single cartridge
operations only. The OCP pushbuttons remain enabled. Loading and
unloading of cartridges in not automatic; operator intervention is
required to select the next cartridge.

•

Service mode — Unlocks the subsystem from the enclosure; the
subsystem is no longer in Automatic mode. This mode is for you
to use when accessing the drive for head cleaning and for Digital
Services engineers to use when performing servicing procedures.

You can select these modes through the Mode Select key (Figure 1–4) on
the front of the Tx857 subsystem.
See Chapter 2 for information on using the modes and the Mode Select
key.

1–8 Overview

Figure 1–4 Tx857 Subsystem Mode Select Key Symbols

MODE SEL E C T K E Y

OCP
DISABLED
AUTOMATIC
MODE

SERVICE
MODE

MANUAL
MODE

SHR_X1025D_89

Overview 1–9

1.5 Hardware Components
The Tx857 magazine tape subsystem consists of the following major
hardware components (Figure 1–5):
•

Loader transfer assembly

•

Magazine

•

TK85 tape drive

•

Controller module

•

Rear chassis

1.5.1 Loader Transfer Assembly
The Tx857 subsystem has a loader transfer assembly that contains the
electromechanical assemblies required to store and move cartridges for
use by the TK85 tape drive.
You must insert cartridges into the magazine, then insert the magazine
into the receiver. An internal elevator mechanism, in the loader transfer
assembly, moves to each of the storage slots. The elevator loads and
unloads cartridges into the drive, and returns the cartridges to their
original storage slots in the magazine after they have been used.
The loader transfer assembly can:
•

Scan the magazine for cartridges

•

Unload cartridges from the magazine

•

Load cartridges into the drive

•

Unload cartridges from the drive

•

Restore cartridges to their original slots in the magazine

NOTE
Do not press the Load/Unload button on the Tx857 OCP to abort
functions of the loader transfer assembly. Type Ctrl/Y or Ctrl/C
instead.

1–10 Overview

Figure 1–5 Tx857 Magazine Tape Subsystem Block Diagram

DOCUMENTATION

COUNTRY
KITS

HOST
S/W
(VMS)

RACK
MOUNT
KIT

MAGAZINE
CONTROLLER
MODULE

TK85

REAR
CHASSIS

LOADER
TRANSFER
ASSEMBLY

SHR_X1009C_89

Overview 1–11

1.5.2 Magazine
The magazine is a removable storage rack that can store up to seven
CompacTape III cartridges. The magazine consists of seven slots in which
the cartridges are loaded; these slots are numbered from 0 to 6 on the
front of the magazine.
Use the OCP pushbuttons to open the receiver, insert or remove the
magazine, load or unload cartridges, or select a slot.
For more information, see Section 2.3.

1.5.3 TK85 Tape Drive
The TK85 tape drive, in the rear chassis of the Tx857 subsystem, is a
streaming tape drive that stores up to 2.6 gigabytes of data on each of its
tape cartridges. The controller module connects the Tx857 subsystem to
the host system, and initiates commands to the TK85 tape drive.

1.5.4 Controller Module
The controller module is the Tx857 subsystem’s interface to the host
system through the bus. For systems with a DSSI bus and a TF857, the
module is a DSSI controller. For systems with a SCSI bus and the TZ857,
the module is a SCSI controller. The host system initiates commands to
the Tx857 subsystem and TK85 drive through the controller module.

1.5.5 Rear Chassis
In addition to the TK85 tape drive and controller module, the rear chassis
contains the power supply, fan, handle motor assembly, and interlock
switch. The power supply provides power to the rear chassis components
and to the loader transfer assembly. The fan cools the entire Tx857
subsystem. The handle motor assembly lifts and lowers the drive’s handle
when cartridges are ready for loading into, or unloading from, the drive.
The interlock switch is a safety feature that interrupts voltage when you
access the drive for head cleaning.

1–12 Overview

1.6 CompacTape III Cartridge

The CompacTape III cartridge (Figure 1–6) is a
4- -inch square, dark

-inch magnetic, metal
gray, plastic cartridge containing 1200 feet of
particle (MP) tape. The cartridge has a write-protect switch to prevent
accidental erasure of data. When the switch is moved to the left and the
small orange rectangle is visible, data cannot be written to the tape. A
package of slide-in labels and a cartridge handling information sheet are
provided with each CompacTape III cartridge.
Figure 1–6 CompacTape III Cartridge

ORANGE
INDICATOR

a
mp

I
pe

WRITEPROTECT
SWITCH

WRITEENABLED

WRITEPROTECTED
SHR_X1020C_89

Overview 1–13

The TK85 tape drive writes 48 tracks (24 pairs) on the tape. It reads
and writes data in a two-track parallel, serpentine fashion, traveling
the entire length of tape on two tracks (at approximately 100 inches per
second). The drive then steps the head and reverses tape direction, and
continues to read/write on the next two tracks.
Use Table 1–1 to determine cartridge compatibility.
Table 1–1 Read/Write Cartridge Compatibility with the TK85 Drive
CompacTape

CompacTape II

CompacTape III

Read

Read/write

CAUTION
For read-only purposes, you can load older CompacTape
cartridges into the TK85 tape drive. Any cartridges recorded
by the TK50, TK70, or TZ30 tape drives can be read by the TK85
drive.
To ensure the reliability of cartridges that contain recorded data and that
may be archived for a long time, store the cartridges in a clean, controlled
environment with the following conditions:
•

Environmental temperature: 18.3°C to 26.1°C (65°F to 79°F)

•

Relative humidity: 20% to 60%

The above environmental conditions are also recommended for the shelf
storage of cartridges that do not contain recorded data.

1–14 Overview

1.7 Specifications
Table 1–2 lists the specifications for the Tx857 magazine tape subsystem,
and Table 1–3 lists those for the TK85 tape drive.
Table 1–2 Tx857 Magazine Tape Subsystem Specifications
Characteristic

Specifications

Height

26.47 cm (10.42 in)

Width

22.20 cm (8.74 in)

Length

64.77 cm (25.5 in)

Weight

24.95 kg (55 lb)

Noise level

62 dB

Environmental temperature
Operating

10°C to 40°C (50°F to 104°F)

Nonoperating

–40°C to 66°C (–40°F to 150.8°F)

Humidity
Operating

20% to 80% noncondensing

Nonoperating

10% to 95%

Certification
EMI

Meets applicable FCC, VDE, and FTZ standards for
Class A devices

Safety

Meets UL, CSA, GS mark, VDE, and IEC standards

Maximum number of cartridges

Electrical rating

100 to 120 Vac/220 to 240 Vac, 2 amperes/1 ampere

AC power consumption

110 W, typical
113 W, maximum

Communications interface

TF857: DSSI bus
TZ857: SCSI bus (single-ended or differential)

Cycle time

50 s, minimum

Overview 1–15

Table 1–3 TK85 Tape Drive Specifications
Characteristic

Specification(s)

Mode of operation

Streaming

Media

12.77 mm (1/2 in) unformatted magnetic tape

Track density

96 tracks/in (48 tracks)

Bit density

42,500 bits/in

Number of tracks

Maximum transfer
rate (at tape)

800 kilobytes/s, formatted

Tape speed

100 in/s

Track format

Two-track parallel, serpentine recording

Cartridge capacity

Up to 2.6 gigabytes, formatted

1–16 Overview

1.8 Supplies and Related Documents
Use Table 1–4 to order additional cartridges or magazines. Contact your
Digital sales representative, or call Digital’s DECdirect ordering service at
1–800–DIGITAL.
Table 1–4 Supplies
Order Number

Description

TK85K–01

CompacTape III Cartridge. Seven cartridges ship with
the Tx857 subsystem.

TK85–HC

CleaningTape III Cartridge. One cartridge ships with
the Tx857 subsystem.

TK85–M

Magazine. Ships with the Tx857 subsystem.

Use the documents in Table 1–5 as supplements to this manual.
Table 1–5 Related Documents
Order Number

Title

AA–Z407B–TE

VAX/VMS Backup Utility Reference Manual

AI–Y506B–TE

Guide to VAX/VMS Disk and Magnetic Tape Operations

AA–Z424A–TE

VAX/VMS Mount Utility Reference Manual

EK–OTF85–OM

Tx85 Series Cartridge Tape Subsystem Owner’s Manual

EK–OTK85–RC

Tx85 Tape Drive Operator’s Reference Card

2
Operation
This chapter explains Tx857 subsystem operation:
•

Power-on process

•

Mode Select key modes

•

Operator control panel (OCP) indicator functions

•

Slot Select, Load/Unload, and Eject button functions

•

Magazine cartridge insertion and removal

2.1 Power-On Process
When the Tx857 subsystem powers on, all of the indicators on the
operator control panel (OCP) light, within 15 seconds. The power-on
self-test, or POST, is initializing the subsystem. When POST completes
successfully, all OCP indicators, including the Magazine Fault and Loader
Fault indicators, turn off—except for Power On.
NOTE
If the Magazine Fault or Loader Fault indicator remains on, POST
has detected an error. See Chapter 4 for error conditions.
The elevator scans the magazine to determine which slots contain
cartridges. If the subsystem has a magazine with a cartridge in
slot 0, and no cartridge is in the drive, these indicators should be on:
Power On
Eject
Load/Unload
Slot Select
Slot 0

2–1

2–2 Operation

2.2 Mode Select Key
The Mode Select key (Figure 2–1) can lock the loader transfer assembly
into the enclosure, as well as lock the receiver closed. It has four modes:
OCP Disabled, Automatic, Manual, and Service. The OCP Disabled,
Automatic, and Manual modes are for operational use; the Service mode
is for head cleaning and servicing procedures.

2.2.1 Operating Modes
The following modes for operational use:
•

OCP Disabled mode — When the magazine is inserted into the
receiver and the receiver is closed, the loader transfer assembly scans
the magazine. The first cartridge in the magazine automatically loads
into the drive. Operations stop if you are copying data to tape and
either the storage capacity of the last tape cartridge is exceeded, or no
tape cartridge is in the next sequential slot in the magazine.
To lock the Tx857 subsystem into the enclosure and lock the
receiver, set the Mode Select key to OCP Disabled mode. The OCP
pushbuttons are disabled.

•

Automatic mode — This mode is the default, or normal, mode of
the Tx857 subsystem. It automatically loads and unloads cartridges
as necessary during backup procedures. Operations stop if you are
copying data to tape and either the storage capacity of the last tape
cartridge is exceeded, or no tape cartridge is in the next sequential
slot in the magazine.
To lock the Tx857 subsystem into its normal operating position in the
enclosure but leave the receiver unlocked, set the Mode Select key to
Automatic mode. The receiver can be opened; all OCP pushbuttons
are enabled.

•

Manual mode — Automatic loading and unloading of cartridges
does not occur in this mode; rather, you must press the Load/Unload
button to move each cartridge. This mode is most useful for, but not
restricted to, copying specific files to or from tape.
To lock the Tx857 subsystem into the enclosure, set the Mode Select
key to Manual mode. The receiver is unlocked and can be opened; all
OCP pushbuttons are on.
NOTE
During Manual mode, the cartridge returns to the magazine,
but the current Slot Select indicator does not advance forward
to the next available cartridge.

Operation 2–3

Figure 2–1 Tx857 Operator Control Panel

O PERAT O R CO NT RO L PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL
(TF857 ONLY)

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025E_91

2–4 Operation

2.2.2 Service Mode
Service mode is for performing head cleaning by manually loading the
CleaningTape III and for performing servicing procedures. See Chapter 5
for information on head cleaning.
To unlock the Tx857 subsystem from its enclosure and remove it from its
normal operating position, set the Mode Select key to Service mode. The
receiver is unlocked and can be opened.

2.3 Operator Control Panel
The Tx857 operator control panel (OCP) has 3 OCP pushbuttons and
16 indicators that are used with the Mode Select key (Table 2–1). See
Section 2.2 for information on the Mode Select key and its functions. See
Section 2.4 for more details on button and indicator operations.
Table 2–1 Tx857 Operator Control Panel
Button/Indicator

Color

Function

Eject button

–

Opens the receiver, allowing access to
the magazine for removal and insertion
of cartridges. Also can be used to unload
the tape from the drive to the magazine.

Eject indicator

Green

Indicates a magazine fault, and that
you can press the Eject button to
unload cartridges from the drive to
the magazine and to open the receiver.

Load/Unload button

–

Loads the currently selected cartridge
into the tape drive. Unloads the
cartridge currently in the tape drive.
Resets the subsystem if there is a loader
fault.

Load/Unload indicator

Green

Indicates that you can press the Load
/Unload button.

Slot Select button

–

Increments the current slot indicator to
the next slot.

Slot Select indicator

Green

Indicates that you can press the Slot
Select button. Pressing this button
moves the current slot indicator to the
next slot.

Operation 2–5

Table 2–1 (Continued) Tx857 Operator Control Panel
Button/Indicator

Color

Function

Power On indicator

Green

Indicates the Tx857 magazine tape
subsystem is in a known good power
state (ac and dc voltages are within
tolerance).

Write Protected indicator

Orange

When on, indicates that the cartridge
currently in the drive is write-protected
by one of these methods:
•

Setting the write-protect switch to
write-protect

•

Using software write-protect
qualifiers

•

Using a CompacTape or
CompacTape II cartridge previously
written by another drive

When off, indicates that the current
cartridge is write-enabled.
Tape In Use indicator

Yellow

Indicates tape drive activity as follows:
•

Slow blinking indicates tape is
rewinding.

•

Rapid blinking indicates tape is
reading or writing.

•

When on steadily, indicates that a
cartridge is in the drive and the tape
is not moving.

•

When off, indicates that no cartridge
is in the drive.

Use Cleaning Tape
indicator

Orange

Indicates that the read/write head needs
cleaning. See Chapter 5.

Magazine Fault indicator

Red

Indicates a magazine failure.

Loader Fault indicator

Red

Indicates a loader transfer assembly
error or drive error.

2–6 Operation

Table 2–1 (Continued) Tx857 Operator Control Panel
Button/Indicator

Color

Function

Current slot indicators
0–6

Green

Identifies the current slot (see Slot Select
button). Each current slot indicator
blinks when its corresponding cartridge
moves to or from the drive. Also used
with the Magazine Fault or Loader
Fault indicator to show the type of fault
(Sections 4.4.1 and Section 4.4.2).

2.4 Slot Select, Load/Unload, and Eject Button
Functions
The Slot Select, Load/Unload and Eject buttons are OCP pushbuttons.
They contain a green indicator, and they are operable only when their
corresponding indicators are on.
NOTE
The Load/Unload button has three functions: load, unload, and
reset. If there is a loader fault and the Loader Fault indicator is
on, press the Load/Unload button to reset the Tx857 subsystem.

2.4.1 Selecting a Cartridge
Use the Slot Select button to select a cartridge; press this button
to advance the slot indicator light to the next available slot. After a
successful initialization, the Tx857 subsystem automatically selects slot
0 and the Slot Select button becomes active. The Load/Unload and Eject
indicators remain on during the slot selection.

2.4.2 Loading the Cartridge
Press the Load/Unload button to load the cartridge into the drive.
This action causes the Select Slot, Load/Unload, and Eject indicators to
turn off, and the elevator to move to the selected slot, indicated by the
light. The cartridge is then removed from the magazine and placed in
the elevator. The elevator moves to the drive position and inserts the
cartridge into the drive. The indicators remain off until the tape has
loaded to the beginning of the tape (BOT). After the cartridge is loaded
into the drive, the Eject and Load/Unload indicators turn on, and the
corresponding buttons are enabled. The Slot Select indicator remains off.

Operation 2–7

2.4.3 Unloading the Cartridge
CAUTION
Do not press the Load/Unload button until backup or other tape
operations are stopped at the terminal. Doing so can result in
operation failure and drive unavailability.
When you press the Load/Unload button, the Select Slot, Load/Unload,
and Eject indicators turn off, and the cartridge unloads from the drive
into the magazine. However, automatic operation now stops and the
Select Slot operation does not increment. The indicators turn on once the
cartridge is returned to the magazine.
The Load/Unload indicator must be on before you press the button to
load or unload a cartridge. If the Loader Fault indicator is on, showing a
malfunction, press the Load/Unload button to reset the subsystem and try
to clear the error.

2.4.4 Opening the Receiver
The Eject button opens the receiver for insertion or removal of the
magazine. It is disabled when the Mode Select key is in the OCP Disabled
position. The Eject button can also be used to unload a tape from the
drive.
NOTE
When a cartridge is not in the drive, the Slot Select, Load/Unload,
and Eject indicators are on before any operation begins. Pressing
the Eject button causes all indicators to turn off. The elevator
then returns to its home position and the receiver opens.
When a cartridge is in the drive, the Eject and Load/Unload
indicators are on before the operation begins. When you press the
Eject button, both indicators turn off, and the cartridge unloads
from the drive and moves back into the magazine. The receiver
then opens to allow access to the magazine.
In both situations, once the receiver is closed again, a magazine
scan begins, and the indicators turn back on when the scan is
complete.

2–8 Operation

2.5 Magazine
The front of the magazine has numbers, 0 through 6, that indicate the
number of the slot.
NOTE
Insert and remove all cartridges at the front of the magazine.

2.5.1 Inserting a Cartridge into the Front of the Magazine
To simplify cartridge insertion, place the magazine on its back and
facing you. Each slot is numbered—to ensure that you are inserting
the cartridge correctly in the front of the magazine. Usually, cartridges
are inserted into consecutive slots.
To insert a cartridge into the magazine:
1. Grasp the cartridge with the CompacTape III label facing up and the
write-protect switch facing you (Figure 2–2).
2. Set the cartridge’s write-protect switch to the desired position. If
you want to write on the tape, slide the switch to the right (orange
indicator is not visible). If you want to write-protect the tape, slide
the switch to the left (orange indicator is visible).
3. Insert the cartridge (Figure 2–3) by pushing it into the slot until you
hear a click. A small metal tab holds the cartridge in place.

Operation 2–9

Figure 2–2 Write-Protect Switch on a Cartridge

ORANGE
INDICATOR

p
om

I
pe

WRITEPROTECT
SWITCH

WRITEENABLED

WRITEPROTECTED
SHR_X1020C_89

2–10 Operation

Figure 2–3 Inserting a Cartridge into the Magazine
BACK OF
MAGAZINE

m
Co

5
5

NOTE: Push tape in
until a click is heard

SLOT
NUMBERS
0-6

FRONT OF
MAGAZINE

SHR_X1021_89

Operation 2–11

2.5.2 Removing a Cartridge from the Magazine
To remove a cartridge from the magazine, press the cartridge (Figure 2–4)
at the front of the magazine until you hear a click; then, release. The slot
uses a spring-release action. When you press the cartridge in all the way,
it pops out.
NOTE
Never apply labels to the top or bottom of tape cartridges. Doing
so can cause cartridge jams in the Tx857 subsystem. Use the space
on the front of the cartridge for labels. If a jam occurs, call your
Digital Services representative.

2.5.3 Removing the Magazine from the Receiver
To remove the magazine from the receiver, first be sure that:
1. The Power On indicator is on (Figure 2–1).
2. The tape drive is unloaded.
3. The Eject indicator is on. (It must be on before you can press the
Eject button.)
Then:
1. Press the Eject button (Figure 2–1) to open the receiver.
2. Grasp the receiver after it opens (Figure 2–5), and gently pull it
forward to access the magazine.
3. Grasp the magazine’s handle only to lift the magazine out of the
receiver.

2.5.4 Installing the Magazine into the Receiver
To install the magazine into the receiver:
1. Slide the magazine down into the receiver (Figure 2–5) while holding
the magazine by the handle. Since the magazine is slotted, you can
restore it in the correct orientation only.
2. Push the receiver closed.
3. Observe that the receiver is fully closed in the Tx857 subsystem before
proceeding.

2–12 Operation

Figure 2–4 Removing a Cartridge from the Front of the Magazine
BACK OF
MAGAZINE

NOTE: Push tape in
until a click is heard

1
TM

4
4

5
5

SLOT
NUMBERS
0-6

FRONT OF
MAGAZINE

SHR_X1022_89

Operation 2–13

Figure 2–5 Receiver Opened

FRONT
BEZEL

Ejec

Loa

Slot

Pow

Wri

d/U

nloa

Sele

er O

te P

Tap

Driv

Loa

rote

e In

Use
Cle
anin

Use

g Ta

e Fa

d Fa

ult

SHR-X0046-90

3
TF857 Local Programs
This chapter is for TF857 users only. It describes some of the local
diagnostic programs and utilities that you can access with the TF857
magazine tape subsystem to test and verify that the subsystem is
functioning correctly.
The programs and utilities, also called task names, described in this
chapter are:
•

DIRECT — Provides a directory of available local programs.

•

HISTRY — Displays information about the TF857 subsystem.

•

PARAMS — Allows you to observe and change subsystem parameters.

•

DRVEXR — Exercises the tape drive and displays statistics after
successful completion.

•

DRVTST — Verifies the correct functioning of drive hardware.

•

LDRTST — Exercises the internals of the loader transfer assembly.

NOTE
To abort a local program or utility, type Ctrl/Y or Ctrl/C . Do not stop
diagnostics by pressing the Load/Unload button on the TF857
operator control panel. Doing so can cause system failure.

3–1

3–2 TF857 Local Programs

3.1 Accessing Local Programs
Access local programs with the VMS command:
$ SET HOST/DUP

You need certain VMS privileges to use the SET HOST/DUP command.
(See your system manager.) This command allows you to access the
local programs that reside in read-only memory (ROM) on the TF857
subsystem.
When you execute SET HOST/DUP, communications between the host
system and the TF857 subsystem are through diagnostic utilities protocol
(DUP). Drive operations under DUP are controlled through the local
programs. When you exit the program, control returns to the operating
system.
The following example shows the sequence of commands to access local
programs. These commands are for the VMS operating system, version
5.4.2 or later:
$ SHOW CLUSTER
(Shows the node name of the tape device.)
$ SET DEVICE/noavailable device-name
(Makes the device unavailable to users.)
$ SET HOST/DUP/SERVER=MSCP$DUP/TASK=PARAMS nodename
(Allows you to access programs.)

TASK in the above example refers to one of the six programs listed at the
beginning of this chapter. PARAMS is the program or task name. You
can use any of the program names, depending on what task you want to
accomplish.
Add the qualifier /LOG if you want a record, or log, of the results of the
test run.
CAUTION
The node name is derived from the subsystem’s serial number. If
you change the node name, the host system does not recognize
this name until you reboot the host system.

TF857 Local Programs 3–3

3.1.1 Error Message after Executing SET HOST/DUP
Command
If you receive an error message, such as in the following example,
when using the SET HOST/DUP command, you may need to load the
FYDRIVER program.
Unit Offline
Data Pattern:
Record Byte Count:
Program Object Count:
Tape Object Count:

0
24732
13988
13987

End Message
000A036E 00040000 A1000023 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
Statistical Report
Test Name: FTST03, Pass 16
Random Seed:
1242755630
Byte Count:
0
Pattern Number:
9
Data Errors:
Read
Write
Retries:
4
0
ECC:
0
Hard:
0
0
Data Compare Errors:
0
Mispositions:
0
Kbytes Written:
10380731

0023 - Unit read/write test failed.

Load the FYDRIVER program as follows:
$ MCR SYSGEN
(Accesses SYSGEN.)
$ SYSGEN> LOAD FYDRIVER
(Loads FYDRIVER, a prerequisite to using diagnostics.)
$ SYSGEN> CON FYA0/NOADAP
(Configures FYDRIVER.)
$ SYSGEN> EXIT

3–4 TF857 Local Programs

3.2 DIRECT Utility
The DIRECT utility provides a directory of the diagnostic and utility
programs that are resident in the TF857 subsystem.
An example of a DIRECT display follows:
DIRECT V1.0 D
HISTRY V1.0 D
PARAMS V1.0 D
DRVEXR V1.0 SD
DRVTST V1.0 SD
LDRTST V1.0 SD
Completed

3.3 HISTRY Program
The HISTRY program displays information about the history of the
TF857 subsystem.
An example of the HISTRY display follows:
TF85
DSSI: T8992Q /2 (DIPs)
Controller:
S#: EN03000159
HW: 000/PCB-rev:A000
Bt: 120/42DA8D6A (23-JAN-1991 15:00:47)
Cd: 129/AF19579E ( 7-FEB-1991 15:24:43)
EE: 085 TD: 002
Drive:
S#: EN02900321
HW: 004/A0$0
Cd: 030/4AEC
EE: 015/42CA
Loader (S/H/M): 023/000/000
Power on Hours:
1
Power Cycles:
3
Completed

TF857 Local Programs 3–5

3.4 PARAMS Program
The PARAMS program displays or changes internal parameters for the
TF857 magazine tape subsystem (Table 3–1). Parameters are preset
during manufacturing; however, your system manager may need to
change them with the PARAMS program to configure your system.
Table 3–1 TF857 Subsystem Parameters
Parameter

Definition

UNITNUM

TMSCP unit number.

SYSTEMID

Controller module’s 48-bit system ID.

NODENAME

Node name for the TF857 subsystem.

FORCENAME

1 — Default node name in use. (Derived from the subsystem
serial number.)
0 — Uses value set in NODENAME.

FORCEUNI

Determines whether the TMSCP unit number or DSSI node
ID is used.
1 — Uses the DSSI node ID.
0 — Uses the TMSCP unit number.

3–6 TF857 Local Programs

3.4.1 Displaying, Setting, and Saving Parameters
Use the SET HOST/DUP command to invoke the PARAMS program. The
terminal displays the following prompt:
PARAMS>

Once you invoke the PARAMS program, all interaction is through
commands and responses (Table 3–2).
Table 3–2 TF857 PARAMS Commands
Command

Definition

HELP

Shows all PARAMS commands and their syntax.

SHOW

Displays subsystem parameters.

SET

Sets a parameter to a value.

STATUS

Displays the status of subsystem operations.

WRITE

Records the device parameters changed with the SET
command.

EXIT

Terminates the PARAMS local program.

3.4.2 HELP Command
Use the HELP command to display a list of available PARAMS
commands:
PARAMS> HELP

The PARAMS program responds:
EXIT
HELP
SET {parameter | .} value
SHOW {parameter | . | /class}
/ALL
/DIF
/DSSI
/DUP
/SYSTEM
/TDS /TMSCP
STATUS DATALINK {Reset}
STATUS PATH node_number {Reset}
STATUS LOGS
WRITE

TF857 Local Programs 3–7

3.4.3 SHOW Command
Use the SHOW command to display TF857 subsystem parameters. The
command syntax for displaying specific parameters is:
PARAMS> SHOW parameter

See Table 3–1 for the parameters you can display.
You can add qualifiers to the SHOW command to display classes of
parameter information:
•

SHOW /ALL

•

SHOW /DIF

•

SHOW /DSSI

•

SHOW /DUP

•

SHOW /SYSTEM

•

SHOW /TDS

•

SHOW /TMSCP
NOTE
Be sure to leave a space between the SHOW command and the
/qualifier.

For example, to display the settings of all the TF857 subsystem
parameters, use SHOW /ALL.
To display system parameters, type:
PARAMS> SHOW /SYSTEM

The system displays:
Parameter
Current
Default Minimum Maximum
Radix
--------------- -------------- -------------- -------- -------- -------FORCEEEREBUILD
0
0
0
1 Decimal
CNTHWREV
0
0
0
255 Decimal
HWREVSTRING
"PCB-rev:????" "PCB-rev:????"
Ascii
RGTTAG
"??????"
"??????"
Ascii
UNITID
454E0044ABD7
Quad

3–8 TF857 Local Programs

3.4.4 SET Command
Use the SET command to set, or change, internal TF857 subsystem
parameters. The syntax for the SET command is:
PARAMS> SET parameter value

In the previous example, parameter is the name of the parameter to
be set, and value is the value you want to assign to the parameter. If
abbreviated, the first matching parameter is used without regard to
uniqueness.
See Table 3–1 for a summary of TF857 subsystem parameters available
when using the SET command.
CAUTION
If you type EXIT at the PARAMS> prompt without saving your
modifications, the system displays the message:
Parameter modified but not written.

Still Exit?

If you answer YES, the system returns to the VMS prompt ($).
Your modifications are not saved.
If you answer NO, the system returns to the PARAMS> prompt.
To save your modifications, enter WRITE at the prompt, and
then EXIT. See Section 3.4.6 for more information on the WRITE
command.

3.4.5 STATUS Command
The STATUS command provides status about the operation of the
subsystem.

TF857 Local Programs 3–9

3.4.6 WRITE Command
Use the WRITE command to save, in nonvolatile memory, the changes
you made using PARAMS and its SET command. The WRITE command
is similar to the VMS SYSGEN WRITE command. Syntax is as follows
(no parameters are available):
PARAMS> WRITE

The program responds:
PARAMS> SET NODENAME TAPE1
PARAMS> SET UNITNUM 18
PARAMS> WRITE
Changes require controller initialization, ok? [Y/(N)] Y

This sets the TF857 subsystem’s node name to TAPE1, and the TMSCP
unit number to 18. Executing WRITE, and answering Y(es) to the
question saves the node name and unit number in EEPROM.
NOTE
When you answer Y(es) to the controller initialization prompt,
your changes take effect immediately and program control
returns to the VMS command prompt ($).

3.4.7 EXIT Command
The EXIT command ends the PARAMS program. The word Completed
appears on the screen.
NOTE
To exit from questions in the local program, type EXIT. Do not
stop local programs by pressing the Load/Unload button on the
TF857 OCP. Doing so can cause the current operation to fail.

3–10 TF857 Local Programs

3.5 DRVEXR Program
The DRVEXR program exercises the tape drive. It is an intensive data
transfer test and indicates the overall integrity of the drive. An example
of a DRVEXR display follows:
Write/read anywhere on medium? [1=Yes/(0=No)] 1
User Data will be corrupted. Proceed? [1=Yes/(0=No)] 1
Test Time in Minutes [(10) - 100] 10
Minutes to Complete: 10
Statistical Report
Test Name: DRVEXR, Pass 1
Random Seed:
1111227776
Byte Count:
0
Pattern Number:
0
Data Errors:
Read
Write
Retries:
0
0
ECC:
0
Hard:
0
0
Data Compare Errors:
0
Mispositions:
0
Kbytes Written:
228461

Read:

Test Passed

NOTE
The DRVEXR program prompts you for an execution time; the
DRVTST program displays a specific execution time.

3.6 DRVTST Utility
The DRVTST utility is a pass/fail test that invokes a comprehensive test
of the drive hardware. A Test Complete message or a fatal error message
appears when the test is complete. An example of a DRVTST display
follows:
Write/read anywhere on medium? [1=Yes/(0=No)] 1
User Data will be corrupted. Proceed? [1=Yes/(0=No)] 1
Minutes to Complete: 25
Test Passed

TF857 Local Programs 3–11

3.7 LDRTST Program
The LDRTST program sends commands to the loader electronics module,
which exercises the mechanics of the loader transfer assembly. In
addition, this test checks the status of each cartridge in the magazine. An
example of a LDRTST display follows:
Passes [(0) - 65535]: 1
Loader Exerciser
Loopback Test: Passed
Illegal Command Test: Passed
Internal Self Test
ROM Test: Passed
RAM Test: Passed
EEPROM Test: Passed
CTC Test: Passed
UART Test: Passed
Movement Test
Picker Arm Test: Passed
Cartridge Motor Test: Passed
Handle Motor Test: Passed
Elevator Test: Passed
Unit Available
Cartridge loads:
Unit Available

Cartridge loads:
Unit Available

Statistical Report
Test Name: LDRTST, Pass 1
Random Seed:
0
Byte Count:
0
Pattern Number:
0
Data Errors:
Read
Write
Retries:
0
0
ECC:
0
Hard:
0
0
Data Compare Errors:
0
Mispositions:
0
Kbytes Written:
0
Test Passed

Read:

4
Error Conditions and Problem
Resolutions
This chapter describes the conditions that must be present to ensure that
the OCP pushbuttons (Slot Select, Load/Unload, and Eject) operate
effectively.
This chapter includes instructions on resolving BACKUP operation
failures, descriptions of magazine and loader faults and how to clear
them, and what to check in the event of a power problem.

4.1 Conditions Necessary for Button Operation
Be sure to review information in the previous chapters to ensure that you
are correctly operating the Tx857 magazine tape subsystem.
Before pressing the Slot Select, Load/Unload, or Eject button on the Tx857
OCP, check for the conditions listed in Table 4–1 and be sure that the:
•

Power On indicator is on

•

Receiver is closed

•

Mode Select key is not set to OCP Disabled

Pressing these buttons has no effect if their indicators are off.
NOTE
Do not press the Load/Unload button to abort any function of the
Tx857 subsystem. Type Ctrl/Y or Ctrl/C instead.

4–1

4–2 Error Conditions and Problem Resolutions

See Section 2.4 for more information on the functions of the Tx857 OCP
buttons.
Table 4–1 Tx857 OCP Button Conditions
If you want to. . .

First make sure that
the. . .

Then you can press
this button. . .

Select another slot in the
magazine

Magazine contains at
least two cartridges

Slot Select

Slot Select indicator is on
Load the selected
cartridge into the tape
drive

Magazine contains at
least one cartridge

Load/Unload

Return the selected
cartridge to its original
slot in the magazine

Load/Unload indicator is
on

Load/Unload

Clear a magazine or
loader fault

Load/Unload indicator is
on

Load/Unload

Load/Unload indicator is
on

Magazine Fault or
Loader Fault indicator is
on
Open the receiver, or
unload the cartridge from
the drive and open the
receiver

Eject indicator is on

Eject

Error Conditions and Problem Resolutions 4–3

4.2 Backup Operation Failure
Some manual operations, if not performed correctly, may cause backup
operations to fail during BACKUP:
•

Loading CompacTape or CompacTape II cartridges when executing
write operations

•

Loading write-protected CompacTape III cartridges when executing
write operations

•

Selecting the incorrect cartridge slot from which to initialize
operations

4.3 Avoiding Basic Problems
Follow these guidelines when operating the Tx857 subsystem to avoid
basic problems:
•

Use CompacTape III cartridges or, for read-only operations,
CompacTape or CompacTape II cartridges.

•

Check the tape leader in the cartridge by lifting the cartridge latch
that opens the door to expose the leader. Be sure the leader is in the
same position as the one shown in Figure 4–1.
CAUTION
Do not touch the exposed magnetic tape. If the tape leader is
not in the correct position, use a new cartridge.

•

Be sure that the receiver is fully closed and the current slot indicator
is on for the starting cartridge.

•

Be sure that no slots in the magazine are empty between the starting
cartridge and the expected completion cartridge.

NOTE
The Tx857 subsystem unloads and loads the next cartridge when
the subsystem receives a DISMOUNT command from the system.

4–4 Error Conditions and Problem Resolutions

Figure 4–1 Opening the Cartridge Door to Check the Tape Leader

CARTRIDGE
LEADER

DOOR LOCK
(RELEASE BY LIFTING
DOOR LOCK WITH THUMB)
SHR-0002-86
SHR_X1027_89_CPG

4.4 Error Conditions
Error indications fall into two main categories:
•

Magazine Fault — In most cases, this fault is an operatorcorrectable condition, and is indicated by the Magazine Fault indicator
being on. If you cannot resolve the fault, call your Digital Services
representative.

•

Loader Fault — This is a condition that most likely requires service
from a Digital Services representative. It is indicated by the Loader
Fault indicator being on.

Error Conditions and Problem Resolutions 4–5

4.4.1 Magazine Fault Description
A magazine fault indicates an inconsistency between what the loader
transfer assembly has done with a cartridge and the actual state detected
by the subsystem.
Inconsistent magazine status occurs when:
•

The magazine is full and an extra cartridge is in the drive

•

The magazine is full and an extra cartridge is in the elevator

•

The loader has loaded a cartridge into the drive, but the cartridge has
been manually removed

•

The flag is set in the magazine, but no cartridge is present

•

An unrecognized cartridge is in the magazine

When these conditions are present, the Magazine Fault indicator is on,
indicating a situation that can be corrected by the operator. The Eject
indicator is also on to inform you that this is the only function available
at this time.
Slot indicators are as follows:
•

Slots 6 and 0 light, indicating a cartridge in the drive was not loaded
by the loader transfer assembly.

•

Slots 5 and 0 light, indicating you need to replace any missing
cartridges in the magazine.

NOTE
The Slot 0 indicator is on in all error conditions to indicate that
an error occurred. It is not a Slot Select indicator.
4.4.1.1 Clearing a Magazine Fault
To clear a magazine fault, first try pressing the Load/Unload button. If
the fault does not clear, press the Eject button to open the receiver and
remove the magazine to locate the cartridge error. After you have cleared
the error, try loading and unloading cartridges to verify operation.

4–6 Error Conditions and Problem Resolutions

4.4.2 Loader Fault Description
A loader fault indicates that the Tx857 subsystem has detected a fatal
error in either the loader transfer assembly or the tape drive. In the case
of some loader transfer assembly errors, the subsystem retries the error
three times before indicating failure. All loader faults generate an error
log as well as light the Loader Fault indicator and an associated subcode.
The Loader Fault indicator indicates errors in the loader transfer
assembly, controller module, and drive. The suspected location of a
fault is indicated by the following slot indicators:
•

Slots 4 and 0 light, indicating a controller module fault.

•

Slots 5 and 0 light, indicating a loader transfer assembly fault.

•

Slots 6 and 0 light, indicating a drive fault.

NOTE
Error indicators do not blink. During hardware failures, the
controller module determines action.
4.4.2.1 Clearing a Loader Fault
When a loader fault occurs, the Load/Unload and Eject indicators are on.
When you press the Load/Unload button, the Tx857 subsystem attempts
to clear the error. When you press the Eject button, the receiver opens to
let you access the magazine.

4.5 Power Problems
If the Power On indicator is not on, or your system does not recognize the
Tx857 subsystem:
•

Verify that the subsystem is pushed completely into the enclosure.
(Power to the loader transfer assembly is disabled when it slides
forward.)

•

Verify with your system manager that the subsystem configuration is
correct.

•

Call your Digital Services representative.

5
Head Cleaning
The Tx857 magazine tape subsystem uses the CleaningTape III cartridge
(Figure 5–1) for cleaning the read/write head in the tape drive.
The CleaningTape III cartridge is a yellow plastic cartridge containing
1200 feet of 1/2-inch, magnetic particle (MP) cleaning tape. You can use
the CleaningTape III cartridge approximately 20 times before it expires.

5–1

5–2 Head Cleaning

Figure 5–1 CleaningTape III Cartridge

in
an

I
pe

SHR_X1020E_89

Head Cleaning 5–3

You can use two procedures to clean the read/write head:
1. Access the tape drive and load the CleaningTape III cartridge directly
into the drive (Section 5.1).
2. Insert the CleaningTape III cartridge into the magazine, where it then
loads into the drive (Section 5.2).
NOTES
Perform the head cleaning procedure only when the orange Use
Cleaning Tape (Figures 5–2 and 5–3) indicator is on.
If the Loader Fault indicator is on, clear the fault before
proceding with head cleaning.

5–4 Head Cleaning

Figure 5–2 Drive Front Panel

ORANGE

ORANGE
YELLOW

GREEN

t
ad
gh
Lo
Li
o
T
t
ai his
t
W
n
pe
O dle pe
a
an t T
H
r
se his
t
In
se
lo e
C dl
an

d
oa
n
nl
to
U
ut t
o
B gh
T
i
ss L
re
P t
is
ai
th
W
n
pe
pe
O dle Ta
an ve
o
em

se
U
ed
g
e
n
ct
in
at dle
ni
te te
e
e a pe per an
ri ro
ap Us Cle Ta
W P
O H
T

Text is 8pt on 8pt
Rt,z,-45
TK85 is TI med (ti) 12pt

CARTRIDGE INSERT/RELEASE HANDLE

SHR-X0056H-91

Head Cleaning 5–5

Figure 5–3 Tx857 Operator Control Panel

O PERAT O R CO NT RO L PANEL

Eject

Load/Unload

MOD E S E LE C T K E Y

BUTTON
AND
INDICATOR
AREA

Slot Select
OCP
DISABLED

0
AUTOMATIC
MODE

Power On

OCP LABEL
CURRENT
SLOT
INDICATORS
0-6

Write
Protected
Tape In Use

MANUAL
MODE

Use
Cleaning Tape

SERVICE
MODE

Magazine
Fault
Loader Fault

Eject

DSSI NODE
ID LABEL
(TF857 ONLY)

Load/Unload

Slot Select

0
Power On
Write
Protected

Write Protect
Load Fault

Tape In Use
Use
Cleaning Tape

Magazine
Fault
Loader Fault

5
4

40% REDUCTION

SHR_X1025E_91

5–6 Head Cleaning

5.1 Accessing the Tape Drive
Unless otherwise instructed by a Digital Services representative, open the
Tx857 subsystem to access the tape drive for head cleaning only.
To access the tape drive:
1. Be sure that all Tx857 subsystem operations are stopped.
2. Ensure that the Eject indicator is on (Figure 5–3).
3. Set the Mode Select key to Service mode (Figure 5–3).
4. Press the Eject button and remove the magazine, if present.
5. Pull the Tx857 subsystem out of the storage array and toward you by
placing your hand under the top of the Tx857 subsystem’s front bezel
(Figure 5–4).
WARNING
If, after pulling the subsystem forward, the Power On
indicator does not turn off, do not attempt the head cleaning
procedure.
6. Lift the loader open latch (Figure 5–5) (to the right of the unit).
7. Move the loader transfer assembly to the left, taking care not to hit
the storage array.
You now have access to the drive’s cartridge entrance (Figure 5–2).

Head Cleaning 5–7

Figure 5–4 Sliding the Tx857 Subsystem Toward You

FIRST
MECHANICAL
STOP

4
1

6
3

CXO-2461B
SHR_X1106B_89

5–8 Head Cleaning

Figure 5–5 Loader Open Latch

LOADER OPEN LATCH

SHR-0007-90
SHR-X0140-90-CPG

Head Cleaning 5–9

5.1.1 Loading the CleaningTape III Cartridge into the Drive
Be sure to use a CleaningTape III cartridge. Instructions for loading the
CleaningTape III cartridge follow:
1. Pull the handle to the open position when the green indicator steadily
lights (Figure 5–6).
2. Load the cartridge.
3. Push the handle closed. The green indicator turns off and the yellow
Tape In Use indicator begins to flash, indicating the tape is loading.
When the cleaning process is finished, a beep sounds, indicating that you
can unload the CleaningTape III cartridge.
NOTE
If the Use Cleaning Tape indicator remains on, the cleaning cycle
was not successful due to an expired cartridge. Replace the
cleaning cartridge, and repeat the cleaning process.

5.1.2 Securing the Tx857 Magazine Tape Subsystem
After cleaning the head, secure the Tx857 subsystem as follows:
1. Close the loader transfer assembly.
2. Press the Tx857 loader open latch to secure the Tx857 subsystem
(Figure 5–5).
3. Push the Tx857 subsystem back into the storage array.
4. Be sure that the Power On indicator is on.
5. Set the Mode Select key to a position other than Service mode.

5–10 Head Cleaning

Figure 5–6 Loading the Cartridge

SHR-0256-87
SHR_X1093_89_CPG

Head Cleaning 5–11

5.2 Inserting the CleaningTape III Cartridge into the
Magazine
CAUTION
If you choose to use this cleaning procedure, you must return
the CompacTape III cartridges to their original slots, and remove
the cleaning cartridge from the magazine after the cleaning
procedure is done.
To clean the read/write head by inserting the CleaningTape III into the
magazine rather than the drive, use the following steps (Figure 5–3):
1. Press the Load/Unload button to remove any cartridges that may be
in the drive, and to return them to the magazine.
2. Press the Eject button to open the receiver and remove the magazine.
3. Insert the CleaningTape III cartridge into the first slot of the
magazine.
4. Insert the magazine into the receiver; close the receiver.
5. Press the Load/Unload button to load the cleaning cartridge into the
drive.
Once the cleaning cartridge is loaded, the drive begins the head
cleaning procedure. When the cleaning procedure is complete, the
cleaning cartridge automatically returns to the magazine.
6. Press the Eject button to remove the magazine.
7. Remove the cleaning cartridge from the magazine and replace the
CompacTape III cartridge in the magazine.

A
VMS Operating System Commands
The Tx857 magazine tape subsystem uses most of the standard magnetic
tape commands that can be invoked under VMS operating system version
5.4 or later.
This appendix is a reference only; it does not include all the details that
may be involved in using VMS commands.
For more information about VMS commands and command files, see
the VAX/VMS Guide to Using Command Procedures (AA–H782B–TE),
VAX/VMS Command Language User’s Guide (AA–DO23C–TE), or the
VMS System Manager’s Manual (AA–LA00B–TE).

A.1 Tape Device Specific Commands
Use the following commands to operate the Tx857 magazine tape
subsystem:
•

ALLOCATE

•

BACKUP
MOUNT/FOREIGN
BACKUP
DISMOUNT

•

COPY
MOUNT
COPY
DISMOUNT
INITIALIZE

A–1

A–2 VMS Operating System Commands

A.1.1 ALLOCATE Command
The ALLOCATE command provides exclusive access to a device and
optionally establishes a logical name for that device. Once you have
allocated a device, other users cannot access that device until you
explicitly DEALLOCATE it, or until you log out. Use the following format
to allocate the Tx857 subsystem:
$ ALLOCATE device name: [logical name]

For example, to allocate the Tx857 subsystem for your use and assign it
to the logical name TAPE1, do the following:
$ ALLOCATE MIA0:TAPE1

The Tx857 subsystem’s physical device name is assigned by your system
manager after it is installed.

A.1.2 DEALLOCATE Command
The DEALLOCATE command cancels the exclusive access you assign to
a device with the ALLOCATE command.
$ DEALLOCATE device name: [logical name]

A.1.3 BACKUP Command
The BACKUP command provides protection against file volume
corruption by creating functionally equivalent backup copies.
Use the following format to back up a file:
$ BACKUP/NOCRC/BLOCK=65534/label=[volume label] filename.ext [devicename or logical name]:filename.bck

In addition to backing up single files, you can back up lists of files and
entire volumes.

VMS Operating System Commands A–3

NOTE
By selecting the /NOCRC qualifier and a large block size with
the /BLOCK qualifier (65534 is the largest possible block size),
you achieve better performance from the Tx857 subsystem. The
previous command line excludes the use of the host-available
CRC error detection/correction capability, and depends on the
embedded error checking and correction capabilities of the Tx857
subsystem. Tx857 error correction capabilities relate specifically
to the Tx857 subsystem—not to the entire system.
Use of the /NOCRC qualifier requires a systems management
decision relative to data integrity rather than performance.
In most cases, Tx857 internal error detection and correction
capabilities are sufficient to ensure data integrity and recovery.
The host-level CRC provides another level of error detection and
correction, which may be important under some conditions.
Refer to your system manuals before deciding on qualifiers for use with
the BACKUP command. For detailed information about BACKUP and
other VMS tape commands, see the VAX/VMS Backup Utility Reference
Manual (AA–Z407B–TE).
CAUTION
The BACKUP command is the only command capable of writing
and reading to multiple tape cartridges. Therefore, it is the only
command that allows writing or reading of a file save set to extend
to new media when the physical end of tape is encountered. Other
commands cannot read or write to more than one tape cartridge
without operator intervention.

A.1.4 MOUNT Command
The MOUNT commands lets you make a magnetic tape volume available
for processing. Note that it loads the tape with the protection set
according to the write-protect switch on the cartridge.
Use the following format to mount a tape with the Tx857 subsystem:
$ MOUNT/FOREIGN [device name] [volume label] [logical name]

As an example, to make TAPE1 available for processing, type the
following:
$ MOUNT/FOREIGN MIA0

The console displays a message:
TAPE1 MOUNTED ON MIA0:

A–4 VMS Operating System Commands

Note that you must use the /FOREIGN qualifier when you are performing
BACKUP commands. Do not use it when you are performing COPY
commands.
NOTE
For improved performance, you can also use the following
command:
$ MOUNT/CACHE=TAPE_DATA

For more information, see the VAX/VMS Mount Utility Reference Manual
(AA–Z424A–TE).

A.1.5 COPY Command
Use the COPY command, with the Tx857 subsystem, to copy files from
cassette tape.
In the following example, the MOUNT command requests that the volume
labeled GMB001 be mounted on the tape drive at MIA0 and assigns the
logical name TAPE1.
The COPY command uses the logical name TAPE1 for the input file
specification. All files on MIA0 are copied to the current default disk and
directory. The files keep their original file names and file types.
$ MOUNT MIA0: GMB001 TAPE1:
$ COPY TAPE1:*.* *.*

NOTE
Using the COPY command to move multiple files may not achieve
optimum performance. Check with your system manager for more
information.

A.1.6 DISMOUNT Command
The DISMOUNT command cancels the MOUNT command, makes the
unit unavailable for processing, and rewinds the tape.
To eject a tape cassette from the tape drive, you must rewind and unload
the tape. Use the following format:
$ DISMOUNT logical name or device name:

To rewind to the beginning of the tape (BOT) without unloading it, use
the following format:
$ DISMOUNT/NOUNLOAD logical name or device name:

VMS Operating System Commands A–5

A.1.7 INITIALIZE Command
CAUTION
Be sure that you are using a scratch tape before initializing;
otherwise, any existing data on the tape will be destroyed.
Use the INITIALIZE command to specify the device name, and write
a volume name to the magnetic tape volume loaded into the TF85 tape
drive. Note that the tape must be write-enabled for the initializing
operation.
Use the following format:
$ INITIALIZE device name: [volume label]

As an example, to initialize the device TAPE1 and assign the volume
name GMB001, type the following:
$ INITIALIZE TAPE1: GMB001

For detailed information regarding volume names and magnetic tape
operations, see the Guide to VAX/VMS Disk and Magnetic Tape
Operations (AA–M539A–TE).

B
Service Offerings
Digital Equipment Corporation offers a range of flexible service plans.

B.1 On-Site Service
On-site service offers the convenience of service at your site and insurance
against unplanned repair bills. For a monthly fee, you receive personal
service from our service specialists. Within a few hours, the specialist is
dispatched to your site with equipment and parts to give you fast and
dependable maintenance.

B.2 BASIC Service
BASIC service offers full coverage from 8 a.m. to 5 p.m., Monday through
Friday. Options are available to extend your coverage to 12-, 16-, or 24hour periods, and to include Saturdays, Sundays, and holidays. Under
the BASIC service plan, all parts, materials, and labor are covered in full.

B.3 DECservice Plan
The DECservice plan offers a premium, on-site service for producing
committed response to remedial service requests made during contracted
hours of coverage. Remedial maintenance will be performed continuously
until the problem is resolved, which makes this service ideal for customers
requiring maximum service performance. Under the DECservice plan all
parts, materials, and labor are covered in full.

B–1

B–2 Service Offerings

B.4 Carry-In Service
Carry-in service offers fast, personalized response, and the ability to
plan your maintenance costs for a smaller monthly fee than on-site
service. When you bring your unit to one of 160 Digital SERVICenter
sites worldwide, factory-trained personnel repair your unit within 2 days.
This service is available on selected terminals and systems. Contact your
local unit. Digital SERVICenter sites are open during normal business
hours, Monday through Friday.

B.5 DECmailer Service
DECmailer service offers expert repair at a per use charge. This service
is designed for users who have the technical resources to troubleshoot,
identify, and isolate the module causing the problem. Mail the faulty
module to our Customer Returns Center where the module is repaired
and mailed back to you within 5 days.

B.6 Per Call Service
Per call service offers a maintenance program on a noncontractual,
time-and-materials-cost basis. It is appropriate for customers who have
to perform first-line maintenance, but may occasionally need in-depth
support from Digital Services.

Index
A

COPY command, A–4

ALLOCATE command, A–2
Automatic mode, 2–2

B
BACKUP command, A–2
Automatic mode, 2–2
Backup failures, 4–3
BOT (beginning of tape), A–4
Button operation
conditions for, 4–2

C
Cartridge
checking the tape leader, 4–3
inserting into magazine, 2–8
loading, 2–6
unloading, 2–7
write-protect switch, 2–8
Cleaning procedure for read/write
head, 5–9
CleaningTape III cartridge, 5–1
inserting into magazine, 5–11
loading into drive, 5–9
CompacTape III cartridge, 1–12
Components, major, 1–9
controller module, 1–11
loader transfer assembly, 1–9
magazine, 1–11
rear chassis, 1–11
TK85 tape drive, 1–11
Configuration, of Tx857 subsystem
physical, 1–3
Controller fault description, 4–6
Controller module, 1–11

Diagnostics, local
accessing, 3–2
DIRECT utility, 3–4
DRVEXR program, 3–10
DRVTST utility, 3–10
FYDRIVER program, 3–3
HISTRY program, 3–4
LDRTST program, 3–11
PARAMS program, 3–5
programs, 3–1
utilities, 3–1
Diagnostic utilities protocol (DUP),
3–2
Digital Services
offerings, B–1
DIRECT utility, 3–4
DISMOUNT command, A–4
Documentation, related, 1–16
Drive
access for read/write head
cleaning, 5–6
cartridge entrance, 5–6
Drive fault description, 4–6
DRVEXR program, 3–10
DRVTST utility, 3–10
DSSI node ID label, 1–4

E
Eject button, 2–6
cartridge in drive, 2–7
no cartridge in drive, 2–7
unload function, 2–4
use of, 4–2

Index 1

2 Index

Eject indicator, 4–2
Error conditions, 4–4
Error message
SET HOST/DUP command, 3–3
EXIT command, 3–9

F
FYDRIVER program, 3–3

H
Head cleaning procedure, 5–1
securing the subsystem, 5–9
HELP command, 3–6
HISTRY program, 3–4

Manual mode, 2–2
Mode Select key
Automatic mode, 2–2
description, 2–2
Manual mode, 2–2
mode definitions, 2–2
OCP Disabled mode, 2–2
Service mode, 2–4
Modes of operation, 1–7
MOUNT command, A–3

O
OCP Disabled mode, 2–2
Operating modes, 2–2
Operating procedures, 2–1

INITIALIZE command, A–5

Parameters, TF857 subsystem
displaying, setting, saving, 3–6
list of, 3–5
PARAMS program, 3–5
EXIT command, 3–9
HELP command, 3–6
SET command, 3–8
SHOW /ALL command, 3–7
WRITE command, 3–9
POST, 2–1
Power-on, 2–1
Power-on self-test
status of OCP indicators, 2–1
Power problems, 4–6
Problem resolutions, 4–1
conditions to check, 4–2, 4–5, 4–6
reset, 4–6

L
LDRTST program, 3–11
Loader fault description, 4–6
Loader open latch, 5–8
Loader reset, 4–6
Loader transfer assembly, 1–9
Load/Unload button, 2–6
reset, 4–6
reset function, 2–4
use of, 4–2
Load/Unload indicator, 4–2

M
Magazine, 1–11, 2–8
inserting cleaning tape, 5–11
removing from receiver, 2–11
restoration into receiver, 2–11
status of, 4–5
Magazine fault
clearing, 4–5

R
Receiver, 2–11
Reset, 4–6
Load/Unload button, 2–4

Index 3

Supplies, 1–16

S
Securing the Tx857 subsystem, 5–9
Service mode
unlocking the Tx857 subystem,
2–4
Service plans, B–1
SET command, 3–8
SET HOST/DUP command
accessing local programs, 3–2
error message, 3–3
SHOW /ALL command, 3–7
Slot Select button, 2–6
operation, 2–6
use of, 4–2
Slot Select indicator, 4–2
Specifications
TF857 subsystem, 1–14
TK85 tape drive, 1–15

T
Tape leader, 4–3
TK85 tape drive, 1–11

V
VMS operating system
commands, A–1
logical device name, A–4
physical device name, A–2

W
WRITE command, 3–9
Write-protect switch, 2–8, A–3