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MAINDEC-8L-D0AA-D

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Document:	8L Memory Protect Test
Order Number:	MAINDEC-8L-D0AA-D
Revision:
Pages:	6
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-8l-d0a/maindec-8l-d0aa-d.pdf

OCR Text

IDENTIFICATION
Product Code:

MAINDEC-8L-DOAA-D (D)

Product Name:

8L Memory Protect Test

Date Created:

October 10, 1968

Maintainer:

Diagnostic Group

Author:

Edward P

Steinberger

ABSTRACT

This program tests the basic operation of the memory protect hardware of the PDP-8/L

computer by attempting to access memory locations on the last page of computer memory

Access by

the instructions ISZ Y, DCA Y and JMS Y to the last page of memory is illegal if the PROTECT switch
is set to l

2.11

REQUIREMENTS

Eguipment

PDP-8/L
2 .2

S_tgr_g_g_e
The program occupies locations 0202 to 0261 and locations 7600 and 7601 of the current

memory bank and tests the first two locations of each memory page and location 7777 in the current

memory bank

2 .3

Preliminary Programs
PDP-B/L Instruction Tests

LOADING PROCEDURE

The program is loaded into the memory bank being tested by the standard binary loader with
the PROTECT switch set to 0.

If 8K of memory is available, load the program into both memory banks.

STARTING PROCEDURE

4.l

Control Switch Settings
None

4.2

Starting Address
0202

4.3

Program and/or Operator Action
See Section 5 .3

5.l

OPERATING PROCEDURE

Operational Switch Settings
None

5.2

Subroutine Abstracts
None

5.3

Program and/or Operator Action

5.3.l

PDP-S/L with 4K of Memory

a. WlththePROTECT switch set to 0, start the computer at 0202. It should stop at

location 0000 with the following indications: MA=0000, MB=7402, AC=0002, FETCH, OPR.
other indication is an error (consult the listing).

Any

at
With the PROTECT switch still set to 0, start the computer at 0230. It should stop
OPR.
Any
location 0252 with the following indications: MA=0252, MB==7402, AC=0000, FETCH,

other indication is an error.

With the PROTECT switch set to I, start the computer at location 0202. It should
c.
“hang" at location 02I4 with the following indications: MA=7777, MB=???? (unimportant), AC=0000,
EXECUTE, DCA, PROT.
With the PROTECT switch set to I, depress CONTINUE. Computer should "hang” at
d.
location 0220 with the following indications: MA=7777, MB=????, AC=000I EXECUTE, ISZ, PROT.
,

e
With the PROTECT switch set to I, depress CONTINUE
Computer should "hang” at
location 0227 with the Following indications: MA=7777, MB=????, AC=0002, EXECUTE, JMS, PROT.
.

With the PROTECT switch set to I, depress CONTINUE.

cation 0252 with the Following indications:

5.3.2

Computer should halt at lo-

MA=0252, MB=7402, AC=0000, FETCH, OPR.

PDP-8/L with BK OF Memory

a
With the PROTECT switch set to 0, start the computer at 0202 of bank 0 (DF=0). It
should stop at location 0000 of bank 0 with the following indications: MA=0000, MB=7402, AC=0002,
FETCH, OPR. Any other indication is an error.
.

With the PROTECT switch still set to 0, start the computer at location 0230 of bank 0

It should stop at location 0252 of bank 0 with the following indications:

(DF=0).
AC=0000, FETCH, OPR. Any other indication is an error.

5..)

‘

MA=0252, MB=7402,

FETCH, OPR.

With the PROTECT switch set to i _, start the computer at location 0202 of bank 0 (DFZO).
indications: MA=0000, MB=7402, AC=0002,
Any other indicationis an error.

With the PROTECT switch set to I, start the computer at location 0230 of bank 0 (DF=0).

It should stop at location 0000 of bank 0 with the

following

It should stOp at location 0252 of bank 0, with the following indications:

MA=0252, MB=7402,

AC=0000, FETCH, OPR. Any other indication is an error.
e .

With the PROTECT switch set to 0, start the computer at location 0202 of bank I

It should stop at location 0000 of bank I with the following indications:

(DF=l).

MA=0000, MB=7402, AC=0002,

FETCH, OPR. Any other indication is an error.
i.

With the PROTECT switch set to 0,. start the computer at location 0230 of bank I (DF=I).

It should stop at location 0252 of bank I with the following indications:

MA=0252, MB=7402, AC=0000,

FETCH, OPR. Any other indication is an error.
With the PROTECT switch set to I, start the computer at location 0202 of bank I (DF=I).
MA=7777, MB=????
PROT.
AC=0000,
EXECUTE,
DCA,
(unimportant),
9.

It should "hang" at location 0214 of bank l with the following indications:

h.
With the PROTECT switch set to l, depress CONTINUE. Computer should "hang“ at
location 0220 of bank I with the following indications: MA=7777, MB=????, AC=000I EXECUTE,
,

ISZ, PROT.
i.
With the PROTECT switch set to l, depress CONTINUE. Computer should "hang" at
location 0227 of bank I with the Following indications: MA=7777, MB=????, AC=0002, EXECUTE,

JMS, PROT.

i. With the PROTECT switch set to l, depress CONTINUE Computer should halt at
location 0252 of bank I with the Following indications: MA=0252, MB=7402, AC=0000, FETCH, OPR.
.

After running this test, restore location 7777 of the memory bank(s) to 530i for the binary

loader program

ERRORS

See Section 5 for description of errors.

RESTRICTIONS

None

MISCELLANEOUS

8 .l

Execution Time
Execution time is dependent upon operator reSponse time.

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