GM 853

This appears to have 8 “Bytewide” sockets, capable of accepting either RAM or EPROM. These would be mapped into the memory space using the DIP switches along the top edge. There is also space for a battery, meaning that the sockets could additionally be used with CMOS static RAM.

The sockets are arranged in 2 banks, A & B. Links are provided to allow the battery to back up either or both banks when fitted with CMOS RAM.

It appears that this particular board has only ever been used for EPROM as the battery, Write LED and Access LED are not fitted.

Credit to Daniel for this picture. 🙂