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DEC-8L-I1AA-D

April 1970

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Document:	MC8/LA and MC8/LB Installation Instructions for Memory Extension Options
Order Number:	DEC-8L-I1AA-D
Revision:	000
Pages:	9
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/dec-8l-i1a/dec-8l-i1aa-d.pdf

OCR Text

DEC-8L-nAA-D

MC8/LA and MC8/LB
INSTALLATION INSTRUCTIONS
FOR MEMORY EXTENSION OPTIONS

DIGITAL

EQUIPMENT CORPORATION n MAYNARD

MASSACHUSETTS

Isl- Printing April 1969
2nd Printing March 1970

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

DEC

PDP

FLIP CHIP

FOCAL
COMPUTER LAB

DIGITAL

INSTALLATION INSTRUCTIONS

FOR
MC8/LA and MC8/LB MEMORY EXTENSION OPTIONS

PURPOSE OF OPTION

The MC8/LA option provides the PDP-S/L Programmed Data Processor with 4096 additional
12-bit (no parity) words of core storage:

The MC8/LB provides 4096 13-bit (including parity) words of

storage

APPLICABILITY

This installation bulletin

applicable to any properly functioning PDP-8/L that is already

equipped with a BA08 Peripheral Expander option cabinet.

PARTS LIST

The parts supplied with this option are listed in Table 1 and shown in Figure

Table
List of Parts

Quantity

Required for Option Installations

Type

Model

Number

Used In

G020

MC8/LA

Location

Use

Sense Amplifier

Row

Slot

A
A
A

8
9

G020

MC8/LB

Sense Amplifier

A
A
A
A
7

9
10
11

Table
List of Parts

Quantity

Type

Model

Number

Used In

G221

G228

All

MC8/LA

MC8/LB

G6I0
1

30005256-1

G624

Memory Selector

Inhibit Driver

Row

Slot

C
C
C
c
D

D
D
D

A
A

1 2-Bit Memory Stock

13-Bit Memory Stack

Resistor Board

9
3

8
9

C,D

5
6
7
5

13-Bit B-Diode Board

All

A-Diode Board

MC8/LB

G612

Location

Use

B-Diode Board

G610
30005256-2

(Cont)

A-Diode Board

MC8/LA

G611

Required for Option Installations

A
A

G785

All

Power Connector

A,B

G826

All

Regulator Control

A,B

Mill

All

Inverter

A
A

24
25

Table
List of Parts

Quantity

Type

(Cont)

Required for Option Installations

Model

Number

Used In

M113

All

Location

Use

2-Input

NAND Gates

Row

Slot

A
A

Mn5

All

3-Input

NAND Gates

Ml 17

All

4-Input

NAND Gates

A
A

M216

All

6 Flip-Flops

A
A

M310

All

Delay Line

A
A

Mi360

All

Variable Delay

M617

All

M903

W025

All

4-Input NOR Buffer

A or B

Cable Connector to

Aor

Central Processor *

A or B
A orB
A or B

A,B
A,B

Cable Connector for
All

Memory Stack

*These cables go into Row B Slots 34, 35, and 36 in the Central Processor

SPECIAL TOOLS AND TEST EQUIPMENT

No special tools are required to install this option.

To verify that the option has been

properly installed, the diagnostic programs listed in Table 2 are required.

35
36

Figure

Location of Modules in BA08

Table 2
List of Equipment

Item

MAINDEC-08-D1EB

Required for Option Testing

Used For
Extended Memory Checkerboard Test

Document and Diagnostic

This test checks worst-case half-select

Binary Tape

noise conditions to determine operational
states of core

MAINDEC-8L-D1GA

memory.

Extended Memory Control Test

Document and Diagnostic

This test checks the Extended

Binary Tape

Control Logic for proper operation.

MAINDEC-08-D1HA

Memory

Extended Memory Address Test

Document and Diagnostic

This test checks all

Binary Tape

occupied by the program to insure that
each address can be uniquely addressed.

MAINDEC-08-D4BA

memory address not

Extended Memory Parity Test

Document and Diagnostic

This test checks for worst-case half-

Binary Tape

select noise conditions within the parity
bit plane.

INSTALLATION PROCEDURE
a.

Unpacking
The MC8/L Memory Extension Control option is shipped in a cardboard box. Carefully

open the box and remove Its contents.

CAUTION
The Core Memory unit is very fragile and should
be handled with extreme care.

Check each item against the packing memo to insure that all hardware and software items
are there.

The container and packing should be saved in cose it is necessary to return the Memory Ex-

tension Control option for service.

Connectio ns and Module Installation
Determine the proper locations for each module either from Table

or DEC Drawing

D-MU-BA 08-04 (Module Utilization BAOB).

CAUTION
Install the

modules in their respective connectors

using great care during the installation to prevent

breaking either the modules or connectors.

When installing the memory unit, the core memory goes in Rows C and D, Slots 5 and 7,
and extends over Slot 6.

The cable connectors (W025) are inserted in Rows A and B with the inhibit

stack connector (either black and white pairs or black and multicolored pairs, an extra twisted pair on
pins BS and BT, and a name plate on one side) in Slot 6; and the sense amplifier stack connector (either

red and white, red and blue, or white and multicolored pairs) in Slot 7.

The interconnecting cables (M903) go from Row A or B Slots 29, 30, and 31 of the

BAOB to Row B Slots 34, 35, and 36 respectively, in the PDP-8/L. These cables should be fed through
the openings in the side of the frames on the BA08 and the PDP-8/L.

After all modules and cable connectors are installed, the MC8/L Extended Memory

Control option is ready for testing.

CHECKOUT PROCEDURE

IniHalizIng
Before operaHng the power switch, check the modules in both the

PDP-8/L and the

BA08 to make sure each module and cable are securely seated in their connectors. Turn the power
switch on the PDP-8/L

on.

ON (the switch key vertical) and make sure the power switch on the BA08

The computer panel lights will

on, and the teletype will come on.

light in some random pattern, the fans in the

computer will come

DEC-8L-HRZA for detailed computer check-out operation if

(See

necessary.)

Preliminary

To check the Extended Memory Control unit, first place the memory protect switch

down, and leave it in the down position for all the following tests except Memory Protect. The computer must be halted to activate any of the keys such as START, CONTINUE,

and LOAD ADDRESS.

EXAMINE, DEPOSIT,

the computer does not respond as expected, depress the STOP key and try

Also, make sure the handle of the ON-OFF key is in the vertical position.

again.

(The computer

can be on with the key functions locked out if the key is turned to the extreme clockwise position.)
The computer will not run continuously unless the SINGLE STEP switch is up.
c.

Diagnostic Tests

To check the MC8/L put the DATA FIELD switch in the up or 1 position, put the

SWITCH REGISTER switches in the down or
SWITCH REGISTER switches in the up or

positions and operate the LOAD ADDR key.

position and operate the DEP key several times.

SWITCH REGISTER switches in the down or

positions and operate the LOAD ADDR key.

SWITCH REGISTER switches in the down or

position again and operate the

of the

Put the

EXAM key.

Place the
Place the

The contents

MEMORY BUFFER register should read all Ts and continued operation of the EXAM key for the

same number of times as the DEP key was operated will cause the MEMORY BUFFER to read all
This test insures that the

MC8/L is performing the read/write function properly.

To test the data field put the DATA FIELD switch in the down or

SWITCH REGISTER switches in the down or
in several successive addresses.

position and operate the

position and the

LOAD ADDR

key.

Deposit 2525

Next put the DATA FIELD switch in the up or 1 position and the

SWITCH REGISTER switches in the down or

EXAM.

I's.

position and operate the LOAD ADDR key and then the

The MEMORY BUFFER should read all Vs as the EXAM key

operated the same number of

times again.

Load RIM in memory 0, then load the BIN loader in memory 0, then use the MAINDEC-

8L-D1GA document and binary tape to run the Extended Memory Control Test.

Next the Extended Memory Address Test can be run using AAAINDEC-08-DlHA-D and
the binary tape.

The document explains the proper procedure to be used with this diagnostic tape in

performing this test.

Run the Extended Memory Checkerboard Test next to check the Extended Memory Control

Unit.

Document MAINDEC-08-DlEB-D explains the proper procedure to be used with this diag-

nostic tape in performing this test.

The Extended Memory Parity Test should be run next on all MC8/LB units.

Document

MAINDEC-08-D4BA-D explains the proper procedure to be used with this diagnostic tape in performing
this test.

This concludes the installation and testing of the MC8/L Extended Memory Control

option.

If the

above tests show problem areas refer to Document DEC-8L-H1BA-D for the proper

maintenance procedures to be followed in correcting all problems.