toholio said:

In related news, my Floppy Emu arrived yesterday and my SE is now working again. I'm already sick of cramming things into 800K disk images. 

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Your SE is compatible with the Floppy Emu hard disk emulation (HD20 mode). Install the alternate firmware from http://www.bigmessowires.com/macintosh-floppy-emu/and you can have disk images up to 2 GB!

olePigeon said:

BMOW, I have a broken PowerKey I'd be happy to donate for Number 6.  I suspect the relay is bad.  I have a new one that I use on my IIci.  It's a combo ADB cable & power switch.  It adds soft-power for any Mac.

Maybe the software and hardware will give you some ideas on how to accomplish it.

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Thanks. I think it's pretty simple. The power key just momentarily connects one of the ADB pins to ground. For Macs with a soft power supply, that makes them turn on. For the Power Key, I think it has its own internal circuit that sees the grounded ADB pin, and switches a 110V or 220V relay to energize the output where the computer is plugged in. The only thing I'm unclear about is how to accomplish soft power-off for a Mac that doesn't have a soft power supply. I can't recall - does the PowerKey require a system init or extension or anything?

The IIci has a soft power supply already, if I'm not mistaken, so why do you need a Power Key on it? Off the top of my head there weren't many ADB-equipped Macs that didn't have the soft power supply. Maybe just the SE and the LC series. Maybe the Classic?