S.C Digital a relatively unknown company in the S-100 marketplace
surprised people by quickly coming out with this IEE-696 compatible 80286
board in January 1983. It was very competitively priced and well
designed.
T
he board features the Intel 80286 and had an empty
socket for the math coprocessor, the 80287. There were a few jumpers
on the board but unfortunately I cannot locate my manual for this board.
I know it works fine as a slave CPU with the Intersystems Z80-II CPU board
when configured as shown in the above picture. The two jumpers in the
bottom middle of the board are for MWRT and "CPUSEL". The latter goes
to S-100 pin #22 to have the Z80 float all address lines. The jumpers at J1
are for wait states (DRAM boards, RAM boards, and IO). The switches on the
top right are for M1CLOCK, MEMW, REFRESH (I have these in on
position) and #4 16 Bit in off position.
I'm look around for the manual, the good news is I do have the S.C. Digital
(hand drawn) schematics for the board.
They can be obtained here.
