FYI, I have written up some recent progress Andrew and I have had in building new S-100 bus computer boards that may be of use in CP/M and MS-DOS systems. The can be seen here:-
(The first 3 menu items).
They are a MSX compatible VDP video board, an ISA bus to S-100 bus converter board and a multi- parallel ports S-100 board. The first two are still a work in progress.