pcjs/apps/pdp10/tests

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page	DEC PDP-10 Opcode Tests	/apps/pdp10/tests/	id type config debugger testka10 pdp10 /devices/pdp10/machine/ka10/test/debugger/machine.xml true

DEC PDP-10 Tests

This page describes a collection of tests used to perform very simple exercises of PDPjs components:

• Simple Opcode Tests
• MACRO-10 Mini-Assembler Tests

Simple Opcode Tests

The PDP-10 machine below loads the following hand-written test:

• PDP-10 Half-Word Opcode Test

Details on how to run and modify the test, and perform similar tests in SIMH, are provided below.

{% include machine.html id="testka10" %}

The PDP-10 Half-Word Opcode Test file specifies that the following words:

0o505040111111,   // HRLI    1,111111
0o541040444444,   // HRRI    1,444444
0o544100000001,   // HLR     2,1
0o504100000001,   // HRL     2,1
...

should be loaded at address 0o100, and that the program counter (PC register) should be set to 0o100. The embedded comments display the instructions that correspond to each word.

If you want to alter or add new instructions, the PDP-10 Debugger now includes a rudimentary assembler. Using the a command, along with an optional start address, you can enter "assembler mode". For example, here's how the first four instructions from the PDP-10 Half-Word Opcode Test could be entered by hand:

>> a 100
begin assemble at 000100
>> hrli 1,111111
000100: 505040 111111  HRLI    1,111111
>> hrri 1,444444
000101: 541040 444444  HRRI    1,444444
>> hlr 2,1
000102: 544100 000001  HLR     2,1
>> hrl 2,1
000103: 504100 000001  HRL     2,1
ended assemble at 000104

Entering a blank line exits "assembler mode". To disassemble the four instructions, use u 100 l4:

>> u 100 l4
000100: 505040 111111  HRLI    1,111111
000101: 541040 444444  HRRI    1,444444
000102: 544100 000001  HLR     2,1
000103: 504100 000001  HRL     2,1

You can also copy-and-paste a series of instructions into the PDPjs Debugger, as long as each command ends with a semicolon:

a 100;
hrli 1,111111;
hrri 1,444444;
hlr 2,1;
hrl 2,1;
end

Individual instructions can also be assembled without entering "assembler mode", as long as you precede each instruction with the a command and a specific address:

a 100 hrli 1,111111;
a 101 hrri 1,444444;
a 102 hlr 2,1;
a 103 hrl 2,1

Individual instructions can be executed with the t command and memory can be dumped with the d command.

After executing the first four instructions and using the d 0 l4 command to dump first four words of memory (also known as AC registers 0-3), you should see the following output:

>> r
000100: 505040 111111  HRLI    1,111111
>> t
000101: 541040 444444  HRRI    1,444444
>> t
000102: 544100 000001  HLR     2,1
>> t
000103: 504100 000001  HRL     2,1
>> t
000104: 000000 000000  UUO     0,0
>> d 0 l4
000000: 000000 000000  111111 444444  444444 111111  000000 000000   

To assemble and test the same instructions in SIMH, using the pdp10 binary:

sim> dep 100 505040111111
sim> dep 101 541040444444
sim> dep 102 544100000001
sim> dep 103 504100000001
sim> ex -m 100-103
100:	HRLI 1,111111
101:	HRRI 1,444444
102:	HLR 2,1
103:	HRL 2,1
sim> dep pc 100
sim> step

Step expired, PC: 000101 (HRRI 1,444444)
sim> step

Step expired, PC: 000102 (HLR 2,1)
sim> step

Step expired, PC: 000103 (HRL 2,1)
sim> step

Step expired, PC: 000104 (000000000000)
sim> ex 0-3
0:	000000000000
1:	111111444444
2:	444444111111
3:	000000000000

MACRO-10 Mini-Assembler Tests

The following command loads an early test of the built-in PDPjs MACRO-10 Mini-Assembler:

a 100 /apps/pdp10/tests/TEXT.MAC

TEXT.MAC is a copy of the file listed on p. 7-9 of the MACRO-10 Assembler Programmer's Reference Manual (June 1972). It's a simple test of nested macro definitions, recursion, expressions using shift operators and character constants, and pseudo-ops IRPC, IFE, IFN, and EXP. It generates 4 words of data.

If successful, the following results should appear:

>> a 100 /apps/pdp10/tests/TEXT.MAC
starting PCjs MACRO-10 Mini-Assembler...
loading TEXT.MAC
4 words loaded at 000100-000103
00=000000000000 01=000000000000 02=000000000000 03=000000000000 
04=000000000000 05=000000000000 06=000000000000 07=000000000000 
10=000000000000 11=000000000000 12=000000000000 13=000000000000 
14=000000000000 15=000000000000 16=000000000000 17=000000000000 
PC=000100 RA=00000000 EA=000000 C0=0 C1=0 OV=0 ND=0 PD=0 
000100: 014101 102103  UUO     2,102103(1)

and if you dump the first 4 words with the command db 100 l4:

>> db 100 l4
000100: 014101 102103  003 004 011 004 041  ....!
000101: 104105 106107  021 004 051 014 043  ..).#
000102: 110111 112113  022 004 111 024 045  ..I.%
000103: 114000 000000  023 000 000 000 000  .....