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DEC-8L-I1AA-D

March 1970

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Document:	MC8/LA and MC8/LB Installation Instructions for Memory Extension Options
Order Number:	DEC-8L-I1AA-D
Revision:	0
Pages:	9
Original Filename:	DEC-8L-I1AA-D_MC8-L_Inst_Mar70.pdf

OCR Text

DEC-8L-ITAA-D

MC8/LA and MC8/LB
INSTALLATION INSTRUCTIONS

FOR MEMORY EXTENSION OPTIONS

DIGITAL

EQUIPMENT

CORPORATION

MAYNARD,

MASSACHUSETTS

Ist Printing April 1969

2nd Printing March 1970

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

PDP

FLIP CHIP

FOCAL

DIGITAL

COMPUTER LAB

INSTALLATION INSTRUCTIONS
FOR

MC8/LA and MC8/LB MEMORY EXTENSION OPTIONS

PURPOSE OF OPTION

The MC8/LA option provides the PDP-8/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 is applicable to any properly functioning PDP-8/L that is already
equipped with a BAO8 Peripheral Expander option cabinet.

PARTS LIST

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

Table 1
List of Parts Required for Option Installations

Quantity

Type

Model

Number

Used In

Use

Location
Row

Slot
8
9

G020

MC8/LA

Sense Amplifier

8
9

G020

MC8/1B

Sense Amplifier

® @@
P> > >

8
9

11
8
9
10

Table 1 (Cont)
List of Parts Required for Option Installations

Quantity

Type

Model

Number

Used In

G221

G228

G610

30005256~1

30005256-2

All

MC8/LA

MC8/LB

MC8/LA

G611
G610

G624

Memory Selector

Inhibit Driver

A-Diode Board

12-Bit Memory Stack

Location
Row

Slot

C,D

B-Diode Board

A-Diode Board

MC8/LB

G612

Use

13-Bit Memory Stack

Resistor Board

7
5

C,D

13-Bit B-Diode Board

All

6
7

G785

All

Power Connector

A,B

G826

All

Regulator Control

A,B

MT111

All

Inverter

Table 1 (Cont)

List of Parts Required for Option Installations

Quantity

Type

Use

Model

Number

Used In

M113

All

M115

All

3-Input NAND Gates

M117

All

4-Input NAND Gates

Row

Location

2-Input NAND Gates

M216

All

6 Flip-Flops

M310

All

.
_
Delay Line

A
A

13
14

M360

All

Variable Delay

Mé617

All

M903

w025

All

4~Input NOR Buffer

Cable Connector to

Central Processor *

Cable Connector for

Memory Stack

Aor B

AorB

A orB

A or B

A rB

A,B

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.

A or B

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

Slot

Figure 1

Location of Modules in BAOS

Table 2
List of Equipment Required for Option Testing

Item

MAINDEC-08-D1EB

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 memory.
MAINDEC-8L-DIGA

Extended Memory Control Test

Document and Diagnostic

This test checks the Extended Memory

Binary Tape

Control Logic for proper operation.

MAINDEC-08-DTHA

Extended Memory Address Test

Document and Diagnostic

This test checks all memory address not

Binary Tape

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

MAINDEC-08-D4BA

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 case it is necessary to return the Memory Ex-~
tension Control option for service.

Connections and Module Installation

Determine the proper locations for each module either from Table 1 or DEC Drawing
D-MU-BA08-04 (Module Utilization BAOS).
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 (M?03) go from Row A or B Slots 29, 30, and 31 of the

BAOS 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 BAO8 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

Initializing
Before operating the power switch, check the modules in both the PDP-8/L and the

BAO8 to make sure each module and cable are securely seated in their connectors.

Turn the power

switch on the PDP-8/L ON (the switch key vertical) and make sure the power switch on the BAOS is
on.

The computer panel lights will light in some random pattern, the fans in the computer will come

on, and the teletype will come on.

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

necessar.)
y
b.

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 com-

puter must be halted to activate any of the keys such as START, CONTINUE, EXAMINE, DEPOSIT,

and LOAD ADDRESS.

again.

If 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.

(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 0 positions and operate the LOAD ADDR key.

Put the

SWITCH REGISTER switches in the up or 1 position and operate the DEP key several times.

Place the

SWITCH REGISTER switches in the down or O positions and operate the LOAD ADDR key.

Place the

SWITCH REGISTER switches in the down or O position again and operate the EXAM key.

The contents

of the MEMORY BUFFER register should read all 1's 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 1's.

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 O position and the
SWITCH REGISTER switches in the down or 0 position and operate the LOAD ADDR

in several successive addresses.

key.

Deposit 25258

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

SWITCH REGISTER switches in the down or 0 position and operate the LOAD ADDR key and then the

EXAM. The MEMORY BUFFER should read all 1's as the EXAM key is operated the same number of
times again.

Load RIM in memory O, then load the BIN loader in memory 0, then use the MAINDEC8L-D1GA document and binary tape to run the Extended Memory Control Test.

Next the Extended Memory Address Test can be run using MAINDEC-08-D1HA-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 Con-

trol Unit. Document MAINDEC-08-D1EB-D explains the proper procedure to be used with this diagnostic 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.