The Steve Ciarcia "Micromint"? PC used a terminal as it's default console.
Its BIOS and/or I/O drivers might help as a starting point.
But, because a significant portion of their users actually wanted a "real"
5150, they came out with an ISA board for it with a 5150 style keyboard
interface. Studying that might help with building an S100 imitation of
the 5150 keyboard interface.
--
Grumpy Ol' Fred cisin at
xenosoft.com