Reply 20 of 41, by jade_angel
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It is possible to put a baby AT motherboard in a full-ATX (or better yet EATX) case, and even to use an ATX power supply. There's an adapter to convert a 20-pin ATX connector to an AT connector - they can be found on eBay and Amazon pretty easily.
Fixing the missing IO shield problem is more difficult - probably the best way is to get a blank IO shield, then measure and drill a 14mm hole in it for the keyboard connector. (And for the PS/2 connector if the board has a PS/2 mouse port, though most don't.) If you feel adventurous, you could cut holes in the ATX IO shield to accommodate parallel and serial ports in the usual ATX locations, too.
The usual ATX power button won't work, but the ATX-AT adapters come with a switch. If you can't find a good place to mount it, you could wire in a different one, or build an SCR-based latching circuit triggered by the standard ATX case switch.
Main Box: Macbook Pro M2 Max
Alas, I'm down to emulation.