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SD SYSTEMS - ExpandoROM
This was SD Systems very first RAM board.

SD Systems 4K RAM

There was really nothing special about this board. It could be set on any 4K boundary in the 64K address space  by the jumpers in the top right of the board.

The manual for this board can be obtained here.  The simple schematic for the board can be obtained here.

 

Other SD Systems  S-100 Boards
 8024 VDB    ExpandoRAM    ExpandoROM     SBC    VersaFloppy I & II   Z8800   PROM-100  
I/O8 Serial Board  4KRAM   Other Boards

 

This page was last modified on 10/25/2013