PiDP-8/I SoftwareTicket Change Details
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Artifact ID: 871cc31fea2bfc3b81c9875182a2badaacc536bd
Ticket: 7ae7a73744c9c0e7b5554f8e2f2af76b100ffef3
LOAD_ADD + EXAM not working
User & Date: tangent 2020-07-20 23:48:11

  1. icomment:
    Put the processor into single instruction mode, set SR with some value, click "Load Add," then "Exam." You get some value on MB, as the 1970 Small Computer Handbook says you should. But load the address and exam again, and you get a *different* value in MB!
    Furthermore, poking around with the "e" command at the SIMH prompt gives different values still. Poking a value in with a "d" command and then trying to Exam it via the front panel doesn't work.
    Is this entirely broken? It used to work. Apparently we're going to have to go bisecting. To whoever does this checking: be aware that you can say "make bin/pidp8-sim", which should avoid the need to rebuild the media on each bisect step.
  2. login: "tangent"
  3. mimetype: "text/x-markdown"
  4. severity changed to: "Critical"
  5. status changed to: "Open"
  6. title changed to: "LOAD_ADD + EXAM not working"
  7. type changed to: "Code Defect"