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Diagnostic Paper Tape Images
Thanks to the iamvirtual.ca website, we have archived the PDP-11 diagnostics shown below. The tapes have been added to the Default PC11 Configuration, so that you can easily load them into any machine with a PC11, such as this PDP-11/20.
As noted for other DEC PDP-11 Tape Images, these "Absolute Format" tapes can be loaded directly into RAM using the machine's "Load" button instead of "Attach", allowing you to bypass the usual three-step process of loading the Bootstrap Loader in order to load the Absolute Loader in order to load the desired tape.
Instructions for Running Diagnostics
Tests 1-12
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 with these three repeated 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.
Test 13
MAINDEC-11-D0MA (NEW NUMBER - DZKAM)
T13
ABSTRACT
This is a test of the JSR, RTS and RTI instructions. It is also the
first time the Register 6 has been "PUSHED and POPPED".
REQUIREMENTS
PDP-11
STORAGE - 0 - 5000
LOADING - Absolute Loader
EXECUTION TIME - 2 min - Bell will ring
STARTING PROCEDURE - Start and Restart at 200
PRINTOUTS - No
SWITCH REGISTER OPTIONS - No
Test 14
Note that, as the instructions indicate, this test will fail on a PDP-11/45 or newer machine, because it expects the MUL instruction to trap.
MAINDEC-11-D0NA (NEW NUMBER - DAKAA)
T14 TRAPS
ABSTRACT
This is a test of all operation and instruction that cause traps.
Also tested are trap overflow conditions, oddities of register 6,
interrupts and the reset instructions.
REQUIREMENTS
PDP-11/20, 11/05, 11/10
STORAGE - 0 - 17500
LOADING - Absolute Loader
EXECUTION TIME - Function or core size - Bell will ring
STARTING PROCEDURE
Start and Restart at 200 for a 4K System
202 for an 8K System
204 for a 12K System
206 for a 16K System
210 for a 20K System
212 for a 24K System
214 for a 28K System
PRINTOUTS - No
SWITCH REGISTER OPTIONS - No
This program should not be used to test 11/40 and 11/45's.
Test 15
MAINDEC-11-D0OA (NEW NUMBER - DZQKA)
T15 Instruction Exerciser
ABSTRACT
This program is designed to be a comprehensive check of all 11 family
processor instructions. The program executed each instruction in all
address modes and includes tests for traps and the teletype interrupt
sequence. The program relocates the test code throughout memory 0-28K.
REQUIREMENTS
PDP-11 family central processor
Optional - KL11-L (line clock)
STORAGE - Program uses all the first 4K of memory (excluding that area
of memory reserved for the loaders.)
LOADING - Absolute Loader
EXECUTION TIME - For 4K - 1 min, for 28K - 5 min.
STARTING PROCEDURE - 200
PRINTOUTS - Yes
SWITCH REGISTER OPTIONS - Yes
SW15 = .... HALT ON ERROR
SW14 = .... LOOP SUBTEST
SW13 = .... INHIBIT ERROR PRINTOUT
SW12 = .... INHIBIT TRACE TRAPPING
SW11 = .... INHIBIT SUBTEST ITERATION
SW10 = .... RING BELL ON ERROR
SW 8 = .... LOAD PDP-11/45 MICRO BREAK REGISTER
SW 7-0 = .... WHEN SET LOADS THE MICRO BREAK REGISTER WITH THE VALUE
SET INTO SW7-0 AT THE BEGINNING OF EACH SUBTEST
NOTE
WHEN ALL SWITCHES ARE DOWN NO TYPEOUTS
WILL OCCUR AT THE END OF A PASS (errors
will be typed). SETTING SW7 WILL CAUSE
END OF PASS MESSAGE TO BE TYPED.
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: