Can't seem to get the interrupt key combo to work?

[Arisotura]

From what I read, there are key combinations that are alternatives to programmer switches -- handy for something like the IIsi, which lacks these switches.

Command+Ctrl+Power to reset the Mac, that one works fine.

Command+Power to send an interrupt, that one doesn't work. I'm not sure why.

Looking at the IIsi schematic, the Egret does have a connection to the NMI line (pin 16), so I guess the functionality wouldn't need extra software. Maybe configuration somewhere, but I didn't find anything? Am I missing something?

I connected a push button to pins 14 and 16 (ground and NMI) of the Egret as a test, and that button brings up the debugger, so there's that. I'm just wondering why the key combination isn't working.

 

[atax1a]

i *think* either some ROMs or some OS versions go about disabling the NMI key at the ADB controller level (where it is processed) but we don't remember where we read that...

 

[atax1a]

per the hardware devnotes the IIci indeed disables the NMI keystroke and requires a control panel to turn it back on. No idea where to find that control panel, of course. Maybe someone else can help there?

 

[volvo242gt]

IIRC, on the IIsi, you have to do command-option-power to get into Macsbug or the built-in debugger. It's been a while since I did it on a IIsi or similar Mac. Majority of my 68K machines have had the programmer's switches installed.

 

[croissantking]

I thought it was a feature of System 7.5 and above.

 

[atax1a]

On machines with an Egret or CUDA microcontroller for the ADB, the cmd-power and cmd-control-power keystroke is handled there, and at least the NMI keystroke can be enabled or disabled by talking to the Egret/CUDA. We would figure that's what the developer technote is talking about with the control panel.

System software can _also_ theoretically detect Cmd-Power and drop into the debugger, but that requires that the system is functioning enough for the keyboard driver to work.

 

[volvo242gt]

I thought it was a feature of System 7.5 and above.

Worked under 6.0.7 on my original IIsi.