SD Systems was a popular S-100 board manufacturer in the late 1970's. They also sold a few computer systems, though the sale of computer systems appears to very limited. This page provides information about both the computer systems and S-100 boards sold by SD Systems.
One of the computers sold by SD Systems was the SDS-100 Computer. It provided a 4mhz Z-80 processor, 80x24 video, and two 1mb DSDD 8" floppy drives as can be seen in this ad.
Pictured on the right is an SD Systems 51009 computer. This computer appears to be a custom product developed by SD Systems for TBS International, a shipping company. A full discussion of the restoration of this computer is available here. The capabilities of this system are similar to the SDS-100 computer.
The original set of SD Systems boards was not available for the restoration, so a board set from Vector Graphic with very similar features and performance was used instead.
SD Systems S-100 Boards
SD Systems made a name for itself designing and selling S-100 boards. The most popular was their line of ExpandoRAM dynamic RAM boards. They also sold a few Z-80 CPU boards, the VersaFloppy I and II floppy disk controllers, an 80x24 video board, along with a few other boards. Manuals for most of their board products are available in the links section at the bottom of this page.