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DEC-08-HRLA-D

December 1970

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Document:	LP08 Line Printer Interface
Order Number:	DEC-08-HRLA-D
Revision:
Pages:	43
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OCR Text

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M'§§tfardf‘flZLZZZ‘hUEéfifl'm"
PDP-8 Family
Interface Manual

LPOB
LINE PRINTER

Eflflflflfifl

DEC-OS-HRLA-D

PDP-8 FAMILY
LP08 LINE PRINTER
INTERFACE MANUAL
.

DIGITAL

EQUIPMENT

_CORPORATION

MAYNARD, MASSACHUSETTS

lst Printing October I970

I920 by Digital Equipment Corporation

The material in this manual is "for informationwpurpémes‘ and is subject to change with-r.
out notice.

The following are trademarks of Digital Equipment
Corporation, Maynard, Massachusetts:
DEC

PDP

FLIP CHIP

FOCAL

DIGITAL

COMPUTER LAB

CONTENTS

Page
CHAPTER I

GENERAL DESCRIPTIO N

l.l

Introduction

1-1

1.2

Specifications

1-1

CHAPTER 2

COMPONENT DESCRIPTION

NNNNNNIO

LP08 Line Printer

2-l

Functional Components

2-l

.l.l

Character Drum

2-l

.l.2

Drum Gate

2-2

.l.3

Hammer Bank

,2-2

Line Printer Power Supply

2-2

Main Control Panel

2-2

LP08 Interface

2-2

Interface Logic Modules

2-4

Logic Module Mounting Panel

2-4

Interface Power Supply

2-4

Interface Signals

2-4

-—l

Lick:

CHAPTER 3

INSTALLATIO N AN D CHEC KO UT

3.1

Space Requirements

3-l

3.2

Unpacking the Line Printer and Interface

3-1

3.3

Inspection

3-3

3.4

Interface Installation

3.5

Checkout Procedure

3-4

3.5.]

Testing

3-4

3.5.2

Accompanying Documents

3-5

3.5.3

Test Equipment

3-6

CHAPTER 4

PRO GRAMMING THE LP08

4.1

Function of Interface

4.2

IOT Programming Instructions and Commands

4-2

4.3

Line Printer Subrouti ne

4-3

CO NTE NTS (Cont)

Page
CHAPTER 5

CIRCUIT ANALYSIS-

5.1

General

5.2

Printer to Interface Signals

5.3

Processor to Interface

5.4

Initial Turn-On of Computer Power

5.5

IOT Commands

5.6

Memory Buffer Bits

5-2

5.7

Output Data Lines

5-3

CHAPTER 6

MAINTENANCE

6.]

General

6-I

6.2

Preventive Maintenance

6-2

6.3

Threshold Ad iustment

6-2

6.4

Drawings

6-2

ILLUSTRATIONS
Figure No.
l-l
2-I

Title

LP08 80-Column Line Printer
LP08 Interface Logic Mounting Frame

File No.

Page

49I6-4

I-I

08-0607

2-3

and Power Supply

LP08 Line Printer Installation Diagram

08-0608

TABLES

Table No.

Title

Page

1-1

Equipment Specifications

1-2

2-1

Coded 64-Character Set

2-1

2-2

Controls and Indicators

2-2

2-3

Interface Logic Modules

2-4

Interface Signals

2-5

3-1

I/O Cable Terminations

3-4

4-1

Printing Speeds

4-1

4-2

IOT Programming Instructions and Commands

4-3

TABLES (Cont)
Table No.

Title

Page

6-1

LP08 Module Schematics

6-2

LP08 Engineering Drawings

6-3

DRAWINGS

Module Schematic No.

Title

Page

B-CS-MlOl -o-1

Bus Data Interface M101

6-4

B-CS-M216-O-l

Six Flip-Flops M216

6-4

B—CS-M10340-l

Device Selector M103

6-5

B-CS-Ml 1 1-0-1

Inverter M111

6—5

B-CS-Ml

15-0-1

8 3-Input NAND Gates M115

B-CS-M906-O-l

Cable Terminator M906

6-6

C-CS-MlOO-O-l

Bus Data Interface M100

6-7

C-CS-MlOZ-O-l

Device Selector M102

6-7

Engineering Drawing No

Title

Page

D-IC-LPO8—P-02

I/O Connectors Positive Bus

6-9

D-IC -LP08-N-02

I/O Connectors Negative Bus

6-11

D-BS-LP08-P-Ol

Positive Interface

6-13

D-BS-LP08-N-01

Negative Interface Logic

D-MU-LP08-P-03

Module Utilization

Logic

6-15

6-17
'

D-MU-LPOS-N—OS

Module Utilization

6-19

Foreword
'

The LP08 Line Printer Interface Manual comprises the Following:

Chapter I

presents the purpose of the Interface and its electrical, mechanical, and
environmental Specifications

Chapter 2

presents a description of the electrical and mechanical components making
up the Line Printer and its associated Interface

Chapter 3

Chapter 4

presents the Space, unpacking,
and check-out procedures

inspection, and installation requirements

presents the functional details, programming instructions, commands, and
'

subroutines

Chapter 5

presents a detailed operational description of the Interface logic

Chapter 6

presents the preventive maintenance procedures necessary to maintain the
Line Printer and Interface in an operational condition

REFERENCE DOCUMENTS

This manual serves as an auxiliary to the Data Products Corporation Technical Manual

DPC-214163A which fully describes the LP08 Line Printer and is referenced throughout to
avoid unnecessary duplication of data and drawings.

The Data Production Corporation

Technical Manual should be consulted for information regarding the installation, operation,

principles of operation, maintenance, troubleshoOting, associated drawings, and related
data concerning the LP08 Line Printer.

Other relevant documents are:

the LP08 Test Interface Logic MAINDEC-8/I-D2AA and

the LP08 Line Printer MAINDEC-8/I—D2AA programming manuals, and the PDP-8
maintenance manuals

Chapter 1
General Description

1.1

INTRODUCTION

The LP08 Line Printer Interface links an 80-column line printer (see Figure l-l) to one of DEC's family
of PDP-8 Processors for impact line

printing, with

speed per line ranging from 356 lines per minute

(lpm) at 80 columns to NW lpm at 20 columns.
Either positive or negative bus computers can be
interfaced with .the Line Printer by interchanging
of the appropriate modules.
common

to both

The wire wrap is

positive and negative interfaces.

The Line Printer is available with 80-column, 64—
or

96-character sets; models are identified by the

following type number:
LP08-x,y'
where ,
x

=F for 80-column, 64—character set
H for 80—column, 96-character set

and,
y =A for Positive bus, 60 Hz operation
’

B for Positive bus, 50 Hz operation

C for Negative bus, 60 Hz operation
D for Negative bus, 50 Hz operation

1 .2

SPECIFICATIO NS

Electrical, operating, physical, environmental, and

ancillary performance specifications are described
in

Table 1—1

Figure l-l‘

l-i

LP08 80-Column Line Printer

Table 1—1

Equipment Specifications

Equipment

Specification
Electrical

Description
117 Vac i 10%, 60 Hz i3 Hz;

Printer

220 Vac i 10%, 50 Hz i3 Hz
250W

120/240 Vac i 10%, 47-63 Hz

Control

60W
25 Ft maximum length oF interconnection signal cable

Signal Cable

(supplied with system)
Printer

Operating

Characteristics
_

‘

80-‘c61um’n model,»

645-character}

Character set:

64 or. 96

Type:
Size:

Open Gothic print
Typically 0.095 in. high and

Code format:

USASCII

Characters per

line:
Character drum:

1760 rpm (64-character drum)

Speed:

1170 rpm

0.065 in. wide
1968
—

(96-character drum)

356 lpm, columns 1-80
"”460 lpm, columns 1—60
650 lpm,; columns 1-40

Print Speed:

11101pm, columns 1-20
80-Col umn model ,‘
,

,96-ch'ar'ac ter

253 lpm, columns 1—80
330 lpm, columns 1-60

Print Speed:

478 lpm, columns 1—40
843 lpm, columns 1-20
Format:

Top-oF-Form control, single line advance.
One pair oF pin-Feed tractors For 1/2 in hole
center, edge-punched paper. Adjustable For
any paper width From 4 in to 9-7/8 in on

Paper Feed:

the 80-column model

per “second

Paper slew speed:

13 in

Print area:

8 in. wide, ‘leFt'iustiFied

Character spacing:

0.100 (i0.005) in. between centers;

(horizontal)

maximum possible accumulative error

For normal

Spacing 0.010 in

per

80-character line
Line spacing:

0.167 (2120.010) in. (6 lines per in.);
each character within j£0.10 in. From
mean

line through character

Table 1-] (Cont)
Equipment Specifications

Specification
Operating

Equipment
Printer

(Con t)

Characteristics

(Cont)

Physical

Printer _, 80-column

Characteristics

Control,
(1 standard DEC
logic panel)

Environ mental
Characteristics

Supplies

Printer and

Control

Paper

Description
Line advance time:

20 ms (maximum)

Character:

Variable reluctance pick—off sense

Synchronization:

Drum position

Height:

5] .5 in

Width:

Depth:

24-1/4 in
34—3/4 in.

Weight:

185 lb

Height:

5.25'in.

Width:

19.0 in.

Depth:

7in.

Operating
Temperature:

50°F (10°C) to 110°F (43°C)

Humidity:

5% to 90% (non—condensation)

Type:

Standard FanFold, edge punched

Dimensions:

4 in. to 9-7/8 in. wide

Weight:
Single copy:

15 lb bond (minimum)

Multi copy:

12 lb bond with single-sheet carbon
for up to six parts

Ribbon

Type:

(BO—column)

inked roll

Width:

9 in.

Length:

35 yd

Thickness:

0.003 in.

(80-column)

Chapter

Component Description

2.1

LP08 LINE PRINTER

The LP08 Line Printer is a free-standing unit comprised of functional components, a power supply, and
the main control panel

(For further description of the Line Printer, refer to Section I of the Data

Produc ts‘ Corporation Technical Manual .)

2 .l .1

Functional Components

Character Drum

2 .l .l .l

and 28 Special symbols

contains 64 different characters:

26 upper-case alphabetics, 10 numerals,

Table 2—l shows the character font and sequence of a standard 64—character

drum.

Table 2-l
Coded 64-Character Set

7
6

0
l

Drum Rows

l-l 6

l7-32

33-48

49-64

Space

Drum Rows

(
)

;

[

]

+
,

2-l

2 .l .I .2

Drum Gate

motor, ribbon guide, bottom ribbon motor, ribbon reversal switches,‘and paper tension bar.

swings out 180°, providing easy access to both the print ribbon and paper loading area

Hammer Bank

2 .l .l .3

top ribbon

is hinged and contains the character drum, drum motor, print ribbon,

The gate

consists of an upper and lower bank, each containing 40 impact hammers.

The upper bank'contains the even-numbered

hammers, and the bottom bank contains the odd.

The

hammer bank also contains the backstop screws for time-of—flight adjustment.

2 .I .2

Line Printer Power Supply

The Line Printer power supply provides iI2, +5, +28, +65 Vdc and 117 Vac for printer operation.

2 .I .3

Main Control Panel

The control panel accommodates the functional indicators and switches.

The controls enable the

operator to place the Line Printer ON-LINE or OFF-LINE and control paper feed in the OFF-LINE
state (see

Table 2—2)

Table 2—2
Controls and Indicators

Function

Control and Indicator

POWER indicator

READY indicator

Lights when ac power is applied to the Printer.
Lights when Printer power is up, interlocks are satisfied,
paper is loaded, drum is up to speed, and over temperature
condition does not exist in the paper drive motor.

ON LINE indicator

Lights when Printer is in ON-LINE mode of operation.

TOP OF FORM switch

Advances tractors to top-of-form position; disabled in
ON—LINE mode.

PAPER STEP switch

ENE/OFF

LINE

Advances paper one line; disabled in ON-LINE mode.

Selects mode of operation for Printer.

switc

2 .2

LP08 INTERFACE

The Line Printer Interface logic, associated module mounting frame, and power supply comprise a one-

piece assembly which can be mounted in a I9 in. cabinet. See Figure 2—1

BLUE

-15V

RED
+5V

BLACK

COM

‘—_JL

L-__|L___
(1

Top View

r®il
“q

36E
gi++++

08-0607

Figure 2-1

Froni' View

LP08 Interface Logic Mounting Frame
and Power Supply

2—3

Interface Logic Modules

2 .2 .1

Table 2-3 lists the modules utilized in both the positive and negative Interface logic; for location of

modules in the mounting Frame, see Module Utilization Diagrams D-MU-LPO8—P-03 and D-MU-LP08'

N-03

Table 2—3
Interface Logic Modules
'

Quantity

2.2 .2

Name

Positive

Negative

Interface

M100

Bus Data Interface

M101

Inverter

M111

Terminator

M906

Device Selector

M103

NAND Gate

M115

Flip-Flop

M216

See Figure 2-1

Interface Power Supply

This power supply furnishes +5 Vdcand -15 Vdc for the Interface logic

2 .2 .4

M906

M102

Logic Module Mounting Panel

This panel contains the logic modules and pluggable cable cards.

2 .2 .3

M111

Interface Signals

The Interface signals are defined in Table 2-4.

Table 2-4
Interface Signals

Signal

Source

READY

Printer

Definition

Indicates to the user's system that the Printer is ready to
be put ON-LINE by the operator.

When READY” is true, the Following conditions are true:
Power is on,

the Printer drum gate is closed,
paper has been loaded,
an

overtemperature condition does not exist

in the paper drive motor, and
e.

DEMAND

Pri n ter

drum motor is up to speed.

Synchronizes data transmission between the Printer and
user's system.

The DEMAND signal requests a character

From the processor and this signal remains true until the

STROBE signal is received. DEMAND is disabled while
the character is stored in the printer memory and during

the print operation. DEMAND can only come true it
READY is true and the operator has placed the Printer
ON-LINE.
STROBE

Us er

Indicates when Printer is to accept the information on
data lines.

Each time the STROBE signal occurs, the

Printer samples the data lines and DEMAND goes False

while the character is stored.
DATA

Us er

Coded information transmitted From the processor to the
Printer on seven data lines
Each character of the
USASCII-i968 character set is transmitted on the seven
parallel data lines.
.

Chapter 3
Installation and Checkout

Although installation and checkout of the LP08 Line Printer and Interface are not a customer function,
this chapter contains brief descriptions of the various procedures involved, for informational purposes

only.
CAUTION

The LPO8 Line Printer and Interface are installed on-site
by DEC Field Service personnel. No attempt should be
made by customer personnel to unpack , inspect, install,

check out, or service the equipment.

3 .1

SPACE

REQUIREMENTS

In planning the installation facility to accommodate the

operating and maintenance personnel

Printer, sufficient space must be allowed for

The physical size and shape of the Line Printer and the overall clearances required for opening the
associated front and rear doors, drum gate, and cage are shown in Figure 3-l

3.2

UNPACKING THE LINE PRINTER AND INTERFACE

First place the Line Printer/Interface in close proximity to the ac power source, then unpack them
as

follows:
Procedure

Step
I

Cut the two steel straps that secure the telescoping cap and stitched

sleeve to the shipping skid.
2

Remove the 'Tri-wall clips from all four sides of the stitched sleeve.

Remove the four bolts, washers, and nUts securing the Line Printer to
the shipping skid, then remove the Printer from the skid and install
in the‘site.
-

Unpack the three Flex-print 1/0 to Interface cables and the single
twisted pair Interface to the Line Printer cable, and install them as
indicated in the Interface Installation section of this chapter.
3-l

J..—

611/2

‘

34 3/4

241/4

TOP

VIEW

PAPER

REAR DOOR OF
LINE PRINTER

1/2

\PAPER
SIDE
r

E
‘

Figure 3-1

LP08 Line Printer Installation'Diagram

3-2

HOPPER

VIEW

oo-osoo

3 .3

INS PECTIO N

After removing the Printer and Interface packing material, impact them and report any damage to the

local DEC sales office.

Inspection procedures are as follows:
Procedure

Step
1

InSpect external surfaces of the Printer and Interface for surface, bezel,
switch and light damage, etc
.

Open the rear and front doors of the Printer and inspect it for internal
damage to electrical and mechanical components.
Inspect the wiring side of the Printer and LP08 logic mounting panels
for bent pins, cut wires, loose external components, and foreign

material.

Also inspect the Interface and computer I/O cables for

damage.
4

Inspect the Printer power supply and the LP08 Interface positive and
negative logic power supply for proper seating of fuses.

Check the equipment received against the packing list to be certain
that all equipment has been received
.

3.4

INTERFACE INSTALLATION

Before the Line Printer and Interface can be made operational, the logic mounting panel and associated
LP08-P (for positive bus devices) or the LP08-N (for negative bus devices)

logic must be installed in a

cabinet rack and interconnected to the LP08 and the user's computer I/O bus.

The cable, with the Flexprint card connector on one end and a conventional connector on the other

end, must be connected between the logic mounting panel and the Line Printer. The card connector
is inserted in logic mounting panel slot A8, and the other end is inserted in the connector on the rear

of the Line Printer.

Refer to Module Utilization Diagrams D-MU-LP08-P-O3 and D-MU-LP08-N—03

The 1/0 Flexprint cables with cable card connectors on both ends must be connected from logic mount-

ing panel slots Al (BAC bits and BIOP pulses), A2 (BMB bits), and A3 (BAC bits, interrupt bus, and

skip bus) to any point on the user's computer I/O bus.

See Table 3-l

It is suggested that the Line Printer ac power cord be plugged into the receptacle on the rear of the
LP08-P or LP08-N associated power supply so that both computer power and Line Printer Interface
power will be shut down 'at the same time.

Table 3-1

1/0 Cable Terminations

Computer Module Slot

Interface Logic
Mounting Panel

Note:

3 .5

3 .5 .1

PDP-8/I

PDP—8

Module Slot

(1)

ME34

(1)

J01

(2)

MF34

(2)

J02

(1)

ME35

(1)

J03

(2)

MF35

(2)

J04

(1)

PE2

(1)

J05

(2)

PF2

(2)

J06

PDP—8L

D36

D35

‘

D34

(1) and (2) indicate the side of the connector block From which
the signals originate.

CHECKOUT PROCEDURE

Testing

After the Line Printer and Interface have been unpacked and installed on-site, the Following tests are

performedby DEC Service personnel:
Procedure

Step

Turn the main power supply maintenance panel ac power circuit breaker

switch to OFF.
Be certain that the Interface cable is securely connected to the rear of

the Line Printer; then install the ribbon in the Printer.
Turn the static eliminator on

Insert the one-part Moore Business Form paper in the Printer so that it

covers

the print hammers and the BOTTOM PAPER OUT switch 55, but

not the TOP PAPER OUT switch

5
'

S4.

Turn the main ac power circuit breaker switch ON, and ascertain that
the READY light does not illuminate but the PAPER FAULT light does
.

Turn the power supply maintenance panel circuit breaker switch OFF
and place the one—part Moore Business Form paper in the Printer so that
it covers the print hammers and the TOP PAPER OUT switch

S4, but not

the BOTTOM PAPER OUT switch 55.
7

Turn the ac power circuit breaker switch ON and ascertain that the

READY light does not illuminate but the PAPER FAULT light does

Procedure

Step

Open the drum gate and remove the paper. Activate the TOP OF FORM
switch and place cantinuous-form paper in the Printer, with the paper
perforations lined up to the arrows
.

If necessary, adiust the right TRACTOR PAPER WIDTH ADJUSTMENT to
obtain the correct width and the TRACTOR HORIZONTAL TENSION
ADJUSTMENT to obtain the correct tension
.

Close the drum gate and make certain that the READY light illuminates
within I5 seconds. Check the TOP OF FORM and PAPER STEP switches
For correct operation
.

Turn the ON LINE/OFF LINE switch to the ON LINE position and check
the TOP OF FORM and PAPER STEP switches to be certain they do not

operate.
II

With the ON LINE/OFF LINE switch set in the ON LINE position,
activate the power supply maintenance panel MASTER CLEAR switch

Check both the TOP OF FORM and PAPER STEP switches to be certain

they operate
12

Turn the ON LINE/OFF LINE switch to the ON LINE position and start

running the MAINDEC-8/I—D2AA diagnostic program, starting at PartWhile the Program is running, adjust the vertical paper
one of Step one.

adjustment vernier
I3

power‘supply

Stop the running of the diagnostic program and depress the
maintenance panel PRINT INHIBIT switch and set the ON LINE/OFF LINE
switch to ON LINE.
one

’

Restart the diagnostic program From Part one of Test

The PRINT INHIBIT light should illuminate and the diagnostic program
should continue to run as it did in Step IO. Continue running the program
For one minute.

With the ON LINE/OFF LINE switch in the ON LINE position, set the
PRINT INHIBIT switch to OFF.

Check the Line Printer for printout errors.

Excluding Part one of Test one of the diagnostic program, run all other
parts of the program for one hour, using single-part paper. The test
should be run with the Printer operating from both a II7 Vac 60-cycle
source and a 220 Vac 50-cycle source
.-

Check the right tractor for correct adjustment and make certain that the
COPIES CONTROL switch is set to the I-2 position.

InSpect all Printer printouts for errors and compare them to the enclosed
factory-printed samples
.

3 .5 .2

Accompanying Documents

Ohe LP08 Line Printer print set and one LP08 Line Printer MAINDEC—8/I-D2AA program are supplied
with the LP08 equipment.

3 .5 .3

Test Equipment

Any one of the PDP-8 family of computers, one Teletype, Model 33 ASR, and one box of single-part
paper (supplied with the Line Printer) comprise the checkout testing equipment.

Chapter 4

Programming the LP08

4.1

FUNCTION

OF INTERFACE

The LP08 Line Printer/Interface is specifically designed! to emulate the Teletype code structure; there

is, therefore, a corresponding Line Printer command For each Teletype printer command.

In addition,

three other commands are available that allow the user to remove the Line Printer from the interrupt
bus and detect Line Printer hardware errors.

bound to an output on the Line Printer

Thus, a user can easily alter a program that is Teleprinter-

The Line Printer does not utilize a conventional vertical format

unit to control paper motions, but rather reSponds to ASCII code in precisely the same manner as a

Tel eprinter

The Line Printer print rate varies between 356 and “TO lpm (PBC), depending upon the printed line

length

If the printed output is left-justified and is

The Printer prints in segments of 20 characters.

between I and 20 characters, the print rate will be IIIO lpm; if the printed output is between 60 and
80 characters per line, the print rate will be 356 lpm

Speed ranges are shown in- Table 4-I .‘

Table 4-l

Printing Speeds

Number of Characters
in line

64-Character Drum

—

Print
i

Rate
1110

41
6T

96—Character Drum

650

460

356

843

—

478

330

253

4-1

40.

Each printable character is selected from 64 available characters and 3 format control characters by
a

7-bit code which is USASClI-l968.

The characters are transferred From the computer processor,

through the AC (bits 5 through II), to the 20-character shift register in the Line Printer control.
After either the shift register is full or one of the three ASCII paper feed characters has been transferred,

printing of that 20-character sector occurs. If printing occurs because of a full buffer, the Printer
control column counter will inCrement so that the next characters will print on the same line.

After

80 characters have been printed on one line, the column counter will automatically reset to column 1

and overprinting will occur if a paper feed command is not transmitted.
The Interface contains a character FLAG which aids the program transfer of printable characters to the
Line Printer.

When raised, the character FLAG indicates that the Printer is ready to receive another

This flag is raised in less than two ps after a load printer buffer command, for all characters

character.

except the twentieth, fortieth, sixtieth or eightieth character transfer. At these discrete times, print-

ing will occur and the FLAG will return in approximately 35 ms.
Thecharacter FLAG is also delayed in returning after transmitting a carriage return, line feed, or form
feed

The raising of the character FLAG causes a program interrupt to indicate a Printer done condition

The character FLAG will remain up until the next LPC or LCF command is issued.
an

If the Printer detects

inoperative condition, i .e., paper out, paper torn printer power off, or overheating of the Printer's
,

motor, an interrupt will occur.
The Interface also contains software provision to remove or restore the Printer to the interrupt bus

This allows a user with many peripherals to service them as necessary, and not be interrupted by a low

priority printer. When the processor is turned on, the Printer is initialized on the interrupt bus.

4.2

IOT PROGRAMMING INSTRUCTIONS AND COMMANDS

The IOT programming instructions and commands which command the Line Printer, are presented in

Table 4-2

4—2

Table 4-2
IOT Programming Instructions and Commands

Octal
Code

Mnemonic

666l

LSF

Function

Skip on character FLAG

The content of the character FLAG is

sensed; if it contains a binary l, the content of the PC is incremented by one so that the next sequential instruction is skipped.
6662

LCF

6663

LSR

Clear character FLAG

Skip on error.

The Line Printer character FLAG is cleared

The level of the ready line is sensed, and, if it is

indicating an error exists, the content of the PC is

at binary 0,

incremented by one so that the next sequential instruction is

skipped
6664

A character is transferred to the Printer buffer
From the content of bits 5 through ll of the AC.
Load Printer buffer.

LLC
-

The PIE Flag is set to binary I,
the
of
the
character
FLAG or lack of Printer
allowing
setting
READY to cause an interrupt.

6665

LSP

Set PIE (program interrupt enable).

6666

LPC

Clear character FLAG and load Printer buffer.
combination of LCF and LLC.

LCP

Set Program interrupt disable. The PIE Flag is set to binary O,
disallowing the character FLAG and Printer READY to cause an
interrupt.

6667
.

4.3

Microinstruction

LINE PRINTER SUBROUTINE

Any Teletype subroutine presently used can be changed to output on the Printer by changing the device
The only exception is a program that depends on the Printer flag not returning in

code From 04 to 66.

less than 100 ms.

The Following represents a typical

PRINT
.

Teletype subroutine rewritten For the LP08 Printer.

/Store return address
/Is Printer Free
/No, inquire again
/Yes, output character
/Clear character From AC
/Continue main program

LSF

JMP .--I
LPC
CLA
JMP I PRINT

The above sequence is accessed by a JMS instruction each time a character is to be output.
assumed that the character code is in the AC

It is

More efficient routines can be written to output if all the output information is known upon entering

the routine.

The Following subroutine prints a string of l00 characters, starting in location 2000:

t5
CLA
TAD ADDR
DCA TEMP]
TAD COUNT

DCA TEMP2
DOIT

LSF
JMP DOIT
TAD I TEMPl
LPC
152 TEMP2
JMP DOIT

ADDR,
COUNT,
TEMP 2,

JMP I PRINT
1777

-l44

/Output character
/Is text string complete
/No continue
/Yes continue
/Initial character address
/Character counter U513 decimal
/Current character address
/Auto—index register definition
,

I?!
TEMP l

/Store return address
/Clear AC
/Load in character address
/Store in auto-index register
/Load character counter
/Store counter
/Is Printer free
/No, inquire again
/Yes load character

Chapter 5
Circuit Analysis

5.1

GENERAL

The Following sections present a detailed descriptive analysis of the LP08 Interface logic

Engineering Drawings LP08-P-OT and D-BS—LP08—N-OI

PRINTER TO INTERFACE SIGNALS

5.2

See

To identify the operational state of the Line Printer in use, the two signals READY and DEMAND are

fed from the, Line Printer to the Interface logic

The READY signal indicates that Line Printer ac power

is on, the paper interlocks are closed, and the character drum motor is up to speed and is not overheat—

ing

When the Line Printer indicates it is able to accept another printable character, DEMAND then

goes high

When DEMAND goes low after receipt of STROBE L, it remains in this state, accepting

data From the seven input DATA lines, 05 through II

Eight input lines originate From the Interface logic and terminate in the Line Printer.
lines and the eighth is the STROBE line.

Seven are DATA

When the STROBE signal goes high, the data on the seven

DATA lines is parallel-transferred to the Line Printer, making DEMAND go low until the Printer logic

shifts the printable character into its associated memory.

5.3

PROCESSOR TO INTERFACE

The Computer processor is interconnected to the Interface by the BAC05 through II, BMBO3 through

II, BIOPT

-2, and -4; and the B INIT lines. BAC05 through BACIl bits are broughtinto the Inter-

face DATA lines,

BMB bits 03 through 08

are

brought in as the device selectors, BMB bits 09 through

I I are brought in to decode the three additional commands for the device code, the three IOP pulses
are

brought in to generate the IOT codes, and the B INIT is brought in as the initialize line.

5—1

5.4

INITIAL TURN-ON OF COMPUTER POWER

When computer power is initially turned on, or its associated KEY switch is activated, B INIT H is

generated within the computer and fed to the Interface program interrupt enable flip-flop PIE, thus,
setting it to the one state placing the Line Printer on the Interrupt bus.

The PIE flip-flop can be

either direct-cleared to its zero state or direct-set to its one state while under program control

The character FLAG flip-flop is set to its one state when the DEMAND line from the Line Printer is

high

The only way DEMAND can go high is when the Line Printer is ready for operation and has

Therefore, the Printer is on the interrupt bus and the character

been manually placed ON-LINE.

FLAG is raised after it has been turned on and has been placed ON-LINE.

5 .5

IOT COMMANDS

When an IOT command is being executed and memory buffer bits 03 through 08 define the 66 device

code, the device selector network generates IOT l, IOT 2, and IOT 4, which are not directly used
but gated with memory buffer bits 09 through II to generate the P SKF, P CLF, P SKE, P STB, P SIE,
and P CIE levels.

5.6

MEMORY BUFFER BITS

If the three low—order memory buffer bits MBO9 through ll form a binary two, P CLF is generated to

clear the character FLAG flip-flop

with READY from the Line Printer.

If these kits form a binary three, P SKE is generated and gated
If READY is not true, it generates a high output pulse, which is

connected to the computer skip bus through SKIP.

If the three low-order memory buffer bits form a binary four, P STB is generated and gated with a

ground level raising STROBE, which is the Line Printer input strobe signal. STROBE is terminated by
DEMAND, which returns to the true condition.
If the three low-order memory buffer bits form a binary five, P SIE is generated, resetting the program

interrupt enable PIE flip-flop to its one state, thus, allowing program interrupt requests to be trans.

mitted to the program interrupt bus

If BMB bit 09 and 10 form a binary six, P SKF is generated and gated with FLAG such
is low, SKIP is generated and returned to the processor,

that, if FLAG

causing the program counter to be incremented.

When the three memory buffer bits form a binary seven, P CIE is generated, direct-clearing the PIE

Flip-Flop to its zero state, thus disallowing program interrupts to be transmitted to the interrupt bus
of the processor

5.7

OUTPUT DATA LINES

The output data lines from the M623 module have been terminated in the Printer controller 100 ohms

to. +5 Vdc to minimize ringing of the signals in the twisted pair 25-ft cable connecting the Interface
and the Line Printer.

Chapter 6
Maintenance

6.]

GENERAL

To ensure maximum life and operating

efficiency in the Line Printer and Interface, 0 regular preventive

maintenance schedule must be established

Unnecessary adjustments should not be made to the Printer;

such adiustments can alter its performance and cause time-consuming maintenance.
NOTE
For comprehensive maintenance information, refer to

Section.5 in the Data Products Corporation Technical
Manual

Periodically inspectvthe Printer for any evidence of component overheating that would discolor resistors
and wiring insulation,

thereby causing breakage and erroneous operation

Replace any questionable

component or module.

Keep the equipment as clean and dry as possible. An air blower or brush with long soft bristles makes
an

excellent dust remover

to scratch

A high-pressure air hose is not recommended, as it can cause dust particles

internal surfaces and components.

Before installing replacement parts, check the circuit to determine the cause of failure.

When per-

forming tests or alignment procedures on the Printer, the input signal conditions must also be checked,
because waveform outputs are dependent on these signals

The logic modules used in the Line Printer are shown in the following Module Schematics:
Cv-CS-MlOO-O—l

B-CS-MlOl -0—l

B-CS-Ml 1 1-0-1

B-CS-M906-0-l

C-CS-MlOZ—O-l

B—CS-MlO3—O-l

B-CS-Ml 15-0-1

B-CS-MZlé-O-l

For the Interface I/O

interconnecting cables for positive and negative logic, see Engineering Drawings

D-IC-LPOS-P-OZ and D-IC-LP08-N-02.

6.2

PREVENTIVE MAINTENANCE

The following preventive maintenance data will enable the user to maintain the Line Printer and Interface in peak operating condition and detect problems before they affect their operational characteristics.
At periodic intervals,.not to exceed 90 days, the Printer/Interface electrical and mechanical

com-

ponents should be inSpected for excessive buildup of dust and dirt, wear of mechanical components

(such as the ribbon drive), loose wiring connections and hardware components, burnt contacts, and
any other evident irregularities

The operational characteristics of the Printer should be periodically checked by using the MAINDEC-

8/I-D2AA diagnostic programs
locating circuit problems
their connectors

6 .3

Diagnostic programs, combined with pulse checking

is suggested for

Logic modules and connections should be checked for proper seating in

THRESHOLD ADJUSTMENT

The only adjustment which compensates for the inclusion of the Interface circuit is the mounting of
Data Products Corporation Receiver Card AK-lO in their associated card location rack, slot 14 (see

Figure 5-2, Data Products Corporation Technical Manual).
To maintain proper voltage, perform the following:

Connect an oscilloscope probe to the Receiver

Card AK-lO test point TP-M (REF VOLTAGE) and adjust the reference voltage generator Ql control

until the threshold level of the seven input data lines is 1/2 of a logical one or is 2.5V.
common

test point for all

seven

input data lines

TP-M is the

(See Figures 6-l3 and 6—l9 in the Data Products

Corporation Technical Manual .)

6.4

DRAWINGS

Module Schematics pertinent to the LP08 Line Printer Interface are listed in Table 6-]; engineering

drawings in Table 6-2.

Table 6-1
LP08 Module Schematics

Module Schematic No.

Title

Data Interface M101

Rev.

Page

B-CS-MiOi-O-t

Bus

B-CS-MZlé-O-l
B-CS-MlO3-O-l

Six Flip-Flops M2l6

6-4

Device Selector M103

6-5

6-4

Table 6-l

(Cont)

LP08 Module Schematics

Module Schematic No.

Title

B-CS-Ml l l-O-l
B-CS-Ml l5-O-l

Inverter Ml ll

6-5

8 3-Input NAND Gates Ml l5

6-6

Cable Terminator M906
Bus Data Interface MlOO
Device Selector Ml02

B-CS-M906-O-l

C-CS-MlOO-O-l
C-CS-MlOZ-O-l

Rev

Page

6-6
6-7

6-8

Table 6-2
LP08 Engineering Drawings

‘

Engineering Drawing No.

Title

D-IC-LPO8-P-02

I/O Connectors Positive Bus
I/O Connectors Negative Bus

D-IC-LPO8-N-02
D-BS-LPOB-P-Ol
D-BS-LP08-N-Ol
D-MU-LP08-P-03
D-MU-LPOS-N-O3

Rev.

Page

6-9

6-H

Positive Interface Logic

6-l3

Negative Interface Logic

6-l5
6-17
6-19

Module Utilization

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