There is a classic mac emulator you can run on a 7 dollar microcontroller, but the adapter to get VGA on the microcontroller costs 50 dollars.
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@sun or you could do it yourself with a handful of resistors, https://github.com/Megatokio/kilipili/wiki/Your-first-own-VGA-Board
@nom it has a bridge for usb keyboard and mouse so that's probably most of the guts