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pcjs/apps/pdp11/tapes/diags/README.md
Jeff 9fe3ba6e09 Added some early PDP-11 diagnostic tapes
2016-11-09 20:25:38 -08:00

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page Diagnostic Paper Tape Images /apps/pdp11/tapes/diags/

Diagnostic Paper Tape Images

Thanks to the iamvirtual.ca website, we have archived a number of PDP-11 diagnostics:

  • MAINDEC-11-D0AA-PB (MAR/70): TEST 1 - BRANCH
  • MAINDEC-11-D0BA-PB (MAR/70): TEST 2 - COND BRANCH
  • MAINDEC-11-D0CA-PB (MAR/70): TEST 3 - UNARY
  • MAINDEC-11-D0DA-PB (MAR/70): TEST 4 - UNARY+BINARY
  • MAINDEC-11-D0EA-PB (MAR/70): TEST 5 - ROTATE+SHIFT
  • MAINDEC-11-D0FA-PB (MAR/70): TEST 6 - COMPARE
  • MAINDEC-11-D0GA-PB (MAR/70): TEST 7 - COMPARE NOT
  • MAINDEC-11-D0HA-PB (MAR/70): TEST 8 - MOVE
  • MAINDEC-11-D0IA-PB (MAR/70): TEST 9 - BIS+BIC+BIT
  • MAINDEC-11-D0JA-PB (MAR/70): TEST 10 - ADD
  • MAINDEC-11-D0KA-PB (MAR/70): TEST 11 - SUBTRACT
  • MAINDEC-11-D0LA-PB (MAR/70): TEST 12 - JUMP

The above tapes have been added to the Default PC11 Configuration, so that you can load them in machines such as this PDP-11/70.

As noted for other DEC PDP-11 Tape Images, any "Absolute Format" tape (which should include all the tapes listed above) can be loaded directly into RAM using the machine's "Load" button instead of "Attach". In most cases, this eliminates the first two steps.

Instructions for Running Diagnostics

Instructions for running "TEST 1 - BRANCH" through "TEST 12 - JUMP" come from the MAINDEC USER REFERENCE MANUAL, OCTOBER 1973, p. 19:

MAINDEC-11-D0AA to D0LA (NEW NUMBER - DZKAA to DZKAL)

T1 to T12

ABSTRACT

This is a group of 12 tests that incrementally test and isolate simple malfunctions of the PDP-11. The tests
should be run in the indicated numerical sequence. The sequence is:

1. Branch
2. Conditional Branch
3. Unary
4. Unary and Binarys
5. Rotate/Shift
6. Compare (Equality)
7. Compare (non equality)
8. Move
9. Bit Set, Clear and Test
10. Add
11. Subtract
12. Jump

REQUIREMENTS

          PDP-11

STORAGE - Use all of 4K [words] except 17500 - 17776 (Reserved for boot and absolute loader)

LOADING - Absolute Loader

EXECUTION TIME - 246 min, depending on test - Bell will ring
 
STARTING PROCEDURE - Start and Restart at 200
 
PRINTOUTS - No
 
SWITCH REGISTER OPTIONS = No

The code for "TEST 1 - BRANCH" is not terribly exciting. Most of its 8Kb length is filled repeatedly with these three instructions:

000210: 060100                 ADD   R1,R0
000212: 000401                 BR    000216
000214: 000000                 HALT

until it reaches this point:

014202: 005267 000022          INC   014230
014206: 001006                 BNE   014224
014210: 012737 000207 177566   MOV   #207,@#177566
014216: 105737 177564          TSTB  @#177564
014222: 100375                 BPL   014216
014224: 000167 163750          JMP   000200
014230: 000000                 HALT

where it increments a zero-initialized word. When the word wraps around to zero again, it will output a BELL character (with bit 7 set; I'm not sure why) to the machine's display terminal, and then run the test again. If a BR instruction fails to branch for some strange reason, then in theory, the machine will fall through to a HALT instruction, and the test will halt.

Newer Paper Tape Software (mid-1970s)

Thanks to the efforts of person(s) unknown, additional paper tape images have been uploaded to bitsavers.org. It's not super organized, so for now, I'm just going to pick out selected tapes and archive them here.

From bitsavers.org, Tray 02: