A ROM emulator for the 71B

[mfleming]

Hummm, I've reread this thread and noticed that most references to a takeover ROM concern the Diagnostic ROM rather than the OS ROM. So perhaps I should clarify things. It's perfectly possible to do a takeover ROM at address zero (assuming you have the shorting plug in Port 1), but not a persistent ROM (OS or otherwise) that would survive a power-down to sleep mode.

So the scenario in which you poke an enabling value, power off, insert the shorting plug, and then have a takeover ROM (e.g. Diagnostic ROM) running when you power back on seems to be feasible. If this sounds desirable, I can certainly add it to the task list. But, if you set the 71B aside for a while and power back on, the ROM won't be there. A quick on/off would bring it back unless you previously disabled it, which might not be want you want

Be careful what you wish for...