S.C Digital came in somewhat late to the S-100 board era. I first
remember them from a December 1979 Byte magazine advertisement for a 16K RAM
board.
The company was located in Aurora, IL., and
used a PO Box as an address -- so they were probably not a large operation.
That said, they did produce some good S-100 boards and unlike many their
size succeeded in getting into the 16 bit CPU arena with very competitively
priced boards.
I have no further
information about the company. If anybody else can provide some please
let me know.