Sing_Step selection of OS fails

[ggrinton]

After making no changes for some time, I have come back to the PIDP8I and found that the selection of a new OS using the IF and Sing_Step switches no longer works for me. Toggling Sing_Step just acts as a "Stop", and I can "Cont" to resume the current OS. Any suggestions of what to look for? I have tried restarting everything, without any impact.

It's probably a separate question, but how can I TOTALLY remove the current PIDP8I software build from the RPi ao that I can be sure I am starting with a fresh build and no hang-overs from an earlier build/release? There seem to be files all over the place, but I don't know if there is a clean "uninstall" command or procedure.

Thanks. Geoffrey

[Geoff Shearer]

I can confirm this behavior. Would love a fix if possible, or instructions about what I am doing wrong.

Thank you 

[Steve Tockey]

Apologies for taking a while to reply but I've been in China for the last 3 weeks without access to any Google-related services thanks to "The Great Firewall of China".

The issues you are describing could be due to the presence of the "Cycle Realistic" (or, "Cycle Accurate") functionality in the latest release, which makes both Sing Step and Sing Inst switches on the front panel behave as on a real PDP-8. The behavior for booting different OSs and mounting USB still exists, it just takes a different action to make it happen. Here's how:

*) Mounting USB media and booting SIMH to other OS's does work, it's just a different switch sequence than before. Put the desired DF and IF same as before, only now (in this order):

     Sing Inst on

     While holding down Cont

     Toggle Sing Step

If you are mounting USB media, you will need to set both Sing Step and Sing Inst back off and then hit Cont to get running again. If you are booting SIMH to a different OS, you might not need to hit Cont. If you're too slow setting Sing Step and Sing Inst back off then you would need to hit Cont.

*) Rebooting the Pi is:

     Sing Inst on

     While holding down Start

     Toggle Sing Step

*) Shutting down the Pi is:

     Sing Inst on

     While holding down Stop

     Toggle Sing Step

Hope this helps,

-- steve

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