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More information about the 11/70 CPU exerciser test (paper-tape version)

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Jeff 2016-11-19 12:07:59 -08:00 • committed by Jeff Parsons
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apps/pdp11/tapes/diags/README.md
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@ -242,7 +242,7 @@ MD-11 11/70 CPU EXERCISER
-------------------------
When started in a PDP-11/70 machine with no disk drives attached (or only RL01/RL02 drives), this diagnostic
displays the following startup text:
displays the following startup information:
MAINDEC-11-DEQKC-B...PDP 11/70 CPU EXERCISOR
OPT.CP=145406
@ -336,15 +336,16 @@ Here's an excerpt:
MOV @#20000,20000(SP)
BR 3$ ; BRANCH OVER NON KERNEL MODE TESTS
In my case, after executing:
This test uncovered a number of stack overflow-related issues that PDPjs needed to resolve,
including the fact that none of the "deferred" addressing modes (3, 5, or 7) apparently trigger a
stack overflow; eg:
021734: 057636 000000 BIS @000000(SP),@(SP)+ ;cycles=17
R0=000000 R1=154112 R2=155754 R3=000376 R4=160316 R5=153412
SP=000376 PC=021734 PS=000340 IR=000000 SL=000377 T0 N0 Z0 V0 C0
021734: 057636 000000 BIS @000000(SP),@(SP)+
the code trapped to vector 4:
whereas mode 6 *does*; eg:
trapped to 004 (YELLOW)
R0=000000 R1=154112 R2=155754 R3=000376 R4=160316 R5=153412
SP=000372 PC=022014 PS=000340 IR=000000 SL=000377 T0 N0 Z0 V0 C0
022014: 012600 MOV (SP)+,R0 ;cycles=0
where it then dropped into an `EMT` instruction and reported an error.
R0=001437 R1=154112 R2=000040 R3=000376 R4=160316 R5=153412
SP=000376 PC=022074 PS=000340 IR=000000 SL=000377 T0 N0 Z0 V0 C0
022074: 050666 177776 BIS SP,177776(SP)