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EK-PSSEB-IN-001

February 1991

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Document:	PS1XR-xx Storage Expansion Box
Order Number:	EK-PSSEB-IN
Revision:	001
Pages:	8
Original Filename:

OCR Text

PS1XR-xx Storage Expansion Box

Order Number EK-PSSEB-IN-001

February 1991
This document describes the PS1XR-xx Storage
Expansion Boxes.
This document is intended to
be read with the BA42 Storage Expansion Box
Installation Guide, EK-SEBOX-IN, in order to provide
full information on the PS1XR-xx Storage Expansion
Boxes.

digital equipment corporation
maynard, massachusetts

First Printing, February 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.
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.
No responsibility is assumed for the use or reliability of software on equipment that is not
supplied by Digital Equipment Corporation or its affiliated companies.
Copyright ©1991 Digital Equipment Corporation All Rights Reserved
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to
restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at DFARS 252.227-7013.
The following are trademarks of Digital Equipment Corporation: applicationDEC, DEC, and
the DIGITAL logo.
The following are third-party trademarks: SCO is a registered trademark of Santa Cruz
Operation, Inc. UNIX is a registered trademark of UNIX Systems Laboratories, Inc.

This document was prepared using VAX DOCUMENT, Version 1.2.

1 PS1XR-xx Storage Expansion Box
The PS1XR series of storage expansion boxes are designed for use with
applicationDEC systems. These systems run the Santa Cruz Operation,
SCO UNIX and SCO Open Desktop operating system software.
NOTE: SCO UNIX, MPX, and Open Desktop, as sold by Digital Equipment
Corporation, include SCO patches and enhancements to improve data
reliability and performance and incorporate several other required bug fixes
in the kit. All of these enhancements, patches, and fixes are available from
SCO, but for your convenience have been packaged into one kit by Digital.
To ensure reliable operation, you should only use SCO UNIX, MPX, and
Open Desktop available from Digital on applicationDEC systems. Digital
Equipment Corporation only supports SCO UNIX, MPX, and Open Desktop
kits that have been provided by Digital Equipment Corporation.

2 Differences Between the BA42 Storage Expansion
Box and the PS1XR-xx Storage Expansion Box
The PS1XR-xx Storage Expansion Box differs from the BA42 Storage
Expansion Box described in the BA42 Storage Expansion Box Installation
Guide in the following ways:
•

Disks in a PS1XR-xx Storage Expansion Box are configured to spin-up
at power-on, not on command. This makes the disks compatible with
SCO UNIX and MS-DOS.

•

SCSI cables with straight connectors, instead of angled connectors, are
shipped with the box.

In all other respects, the PS1XR-xx Storage Expansion Box is the same
as the BA42 Storage Expansion Box described in the BA42 Storage
Expansion Box Installation Guide. Refer to the BA42 Storage Expansion
Box Installation Guide for full details on how to set SCSI ID switches and
install additional drives, and other information on the PS1XR-xx Storage
Expansion Box.

3 Software Support
The Storage Expansion disk drives need to be configured under software
after installation.
When connected to a CPU/SCSI installed in an
applicationDEC multiprocessor system, the drives are configured using the
SCO/MPX software extensions. Refer to the SCO MPX Multiprocessor
Extension Release and Installation Notes for details. When connected to
an ISA SCSI adapter in an applicationDEC single processor system, the

PS1XR-xx Storage Expansion Box

drives are configured using the SCO UNIX system administration shell.
Refer to the SCO UNIX System Administrator’s Reference Manual supplied
with SCO UNIX or the SCO Open Desktop Administrator’s Guide supplied
with Open Desktop.

4 Kit Contents
Figure 1 shows the contents of the PS1XR-xx Storage Expansion Boxes.
Figure 1: PS1XR-xx Storage Expansion Box Contents

50-Pin SCSI Terminator

BC19J-1E 18-Inch 50-Pin
to 50-Pin Connector Cable

Documentation

Power Cord
BC19J-06 Six Foot 50-Pin
to 50-Pin Connector Cable
MLO-006026

Each PS1XR-xx expansion box is shipped from the factory with the following
accessories.
•

Power cord

•

A 50-pin terminator for terminating the SCSI bus on the expansion box

2 PS1XR-xx Storage Expansion Box

•

A 180-centimeter (72-inch) 50-pin SCSI cable with straight end
connectors for connection to an applicationDEC system

•

A 45-centimeter (18-inch) 50-pin SCSI cable with straight end
connectors for connection between two storage expansion boxes

•

Documentation

5 Configurations Available
The PS1XR-xx Storage Expansion Boxes are available in the configurations
shown in Table 1.

Table 1: External Storage Expansion Options
Option

Disks Installed

Voltage

Total External Storage

PS1XR-CA

1 665 MB RZ56

120

665 MB

PS1XR-C3
PS1XR-BA

240
2 665 MB RZ56

PS1XR-B3
PS1XR-FA

1.3 GB

240
1 1.2 GB RZ57

PS1XR-F3
PS1XR-EA

120

1.2 GB

240
2 1.2 MB RZ57

PS1XR-E3

120

2.4 GB

240

Expansion kits are also available for adding additional 665 MB or 1.2 GB
hard disks to the single disk expansion storage boxes (PS1XR-C and PS1XRF). These are listed in Table 2.

Table 2: Storage Expansion Box Options
Options

Contents

Storage Added

PS1XR-DA

1 665 MB RZ56 disk

665 MB

PS1XR-GA

1 1.2 GB RZ57 disk

1.2 GB

Up to two storage expansion boxes can be connected together in a SCSI
bus. Thus the maximum external storage capacity available is 4.8 GB of
data.

PS1XR-xx Storage Expansion Box

Use the instructions in the BA42 Storage Expansion Box Installation
Guide manual to install a second hard disk drive in the PS1XR-xx storage
expansion box.

6 Connecting the PS1XR-xx Storage Expansion
Box to Your System
To connect the PS1XR-xx storage expansion to your system, follow the
instructions as shown in the BA42 Storage Expansion Box Installation
Guide. In summary these steps are:
1. Shut off power.
2. Check the SCSI address of the PS1XR-xx to ensure it is set for your
configuration.
3. Connect the 180-centimeter (six foot) SCSI cable from your system’s
SCSI adapter to the storage expansion box. (The 45-centimeter cable
can also be used if desired and physical restraints permit it.)
4. Install a terminator on the unused SCSI port of the expansion box.
5. Connect the power cord.

NOTE: Both ends of the SCSI bus must be terminated. If your SCSI
adapter has internal and external devices, the terminator resistor packs on
the adapter must be removed, and the ends of both SCSI cables must be
terminated. If your SCSI adapter has only external devices, the terminator
resistor packs on the adapter must remain installed and the unused port on
the expansion box must be terminated.
Refer to your SCSI host adapter documentation for the location of
terminator resistor packs and further information on terminating the SCSI
bus.
Figure 2 illustrates the main steps involved in connecting the PS1XR-xx
expansion box.

4 PS1XR-xx Storage Expansion Box

Figure 2: Connecting the PS1XR-xx Storage Expansion Box
Power Cord

SCSI ID Switches

SCSI Cable

SCSI Terminator
MLO-006180

7 Connecting Two Storage Expansion Boxes
Two storage expansion boxes can be connected together. Use the 45centimeter (eighteen-inch) cable to connect two storage expansion boxes
together. Figure 3 shows how two boxes are connected together. Make
certain that a terminator is installed at the end of the SCSI bus.

PS1XR-xx Storage Expansion Box

Figure 3: Connecting Two Storage Expansion Boxes

Power Cord

Terminator

BACK VIEW
MLO-006027

8 Additional Information
Refer to the BA42 Storage Expansion Box Installation Guide for additional
information on your PS1XR-xx Storage Expansion Box.
Refer to the applicationDEC 433MP Technical Configuration and Option
Installation Guide, EK-PS100-CG, for additional information on connecting
the PS1XR-xx Storage Expansion Box to an applicationDEC 433MP system.
For software configuration information, refer to the SCO MPX
Multiprocessor Extension Release and Installation Notes if the expansion
box is connected to a CPU/SCSI module. When connected to an ISA
SCSI adapter in an applicationDEC single processor system, the drives
are configured using the SCO UNIX system administration shell. Refer
to the SCO UNIX System Administrator’s Reference Manual supplied with
SCO UNIX or the SCO Open Desktop Administrator’s Guide supplied with
Open Desktop.

6 PS1XR-xx Storage Expansion Box