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Added some early PDP-11 diagnostic tapes

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Jeff 2016-11-09 20:25:38 -08:00 • committed by Jeff Parsons
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---
layout: page
title: Diagnostic Paper Tape Images
permalink: /apps/pdp11/tapes/diags/
---
Diagnostic Paper Tape Images
----------------------------
Thanks to the [iamvirtual.ca](http://iamvirtual.ca/collection/systems/mediadoc/mediadoc.html#papertape) website,
we have archived a number of PDP-11 diagnostics:
* ![MAINDEC-11-D0AA-PB (MAR/70): TEST 1 - BRANCH](MAINDEC-11-D0AA-PB.jpg)
* ![MAINDEC-11-D0BA-PB (MAR/70): TEST 2 - COND BRANCH](MAINDEC-11-D0BA-PB.jpg)
* ![MAINDEC-11-D0CA-PB (MAR/70): TEST 3 - UNARY](MAINDEC-11-D0CA-PB.jpg)
* ![MAINDEC-11-D0DA-PB (MAR/70): TEST 4 - UNARY+BINARY](MAINDEC-11-D0DA-PB.jpg)
* ![MAINDEC-11-D0EA-PB (MAR/70): TEST 5 - ROTATE+SHIFT](MAINDEC-11-D0EA-PB.jpg)
* ![MAINDEC-11-D0FA-PB (MAR/70): TEST 6 - COMPARE](MAINDEC-11-D0FA-PB.jpg)
* ![MAINDEC-11-D0GA-PB (MAR/70): TEST 7 - COMPARE NOT](MAINDEC-11-D0GA-PB.jpg)
* ![MAINDEC-11-D0HA-PB (MAR/70): TEST 8 - MOVE](MAINDEC-11-D0HA-PB.jpg)
* ![MAINDEC-11-D0IA-PB (MAR/70): TEST 9 - BIS+BIC+BIT](MAINDEC-11-D0IA-PB.jpg)
* ![MAINDEC-11-D0JA-PB (MAR/70): TEST 10 - ADD](MAINDEC-11-D0JA-PB.jpg)
* ![MAINDEC-11-D0KA-PB (MAR/70): TEST 11 - SUBTRACT](MAINDEC-11-D0KA-PB.jpg)
* ![MAINDEC-11-D0LA-PB (MAR/70): TEST 12 - JUMP](MAINDEC-11-D0LA-PB.jpg)
The above tapes have been added to the [Default PC11 Configuration](/devices/pdp11/pc11/), so that you can load
them in machines such as this [PDP-11/70](/devices/pdp11/machine/1170/panel/debugger/).
As noted for other [DEC PDP-11 Tape Images](/apps/pdp11/tapes/), 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](http://archive.pcjs.org/pubs/dec/pdp11/diags/MAINDEC_User_Reference_Manual_Oct73.pdf),
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](http://bitsavers.trailing-edge.com/bits/DEC/pdp11/papertapeimages/). It's not super organized,
so for now, I'm just going to pick out selected tapes and archive them here.
From [bitsavers.org](http://bitsavers.trailing-edge.com/bits/DEC/pdp11/papertapeimages/20040101/), Tray 02:
* Tape 04: [MAINDEC-11-DEQKC-B1-PB 06/12/78; 11/70 cpu instruction; exerciser; (c)1975,76](MAINDEC-11-DEQKC-B1-PB.json)