| Click here to select a new forum. |
| Can't seem to get the interrupt key combo to work? |
Posted by: Arisotura on 2024-03-23 10:26:06
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. |
Posted by: atax1a on 2024-03-23 11:56:32
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... |
Posted by: atax1a on 2024-03-23 15:14:20
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? |
Posted by: volvo242gt on 2024-03-23 16:46:05
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. |
Posted by: croissantking on 2024-03-23 17:56:33
I thought it was a feature of System 7.5 and above. |
Posted by: atax1a on 2024-03-24 11:21:52
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. |
Posted by: volvo242gt on 2024-03-25 15:00:35
I thought it was a feature of System 7.5 and above. Worked under 6.0.7 on my original IIsi. |
| 1 |