Industrial Micro Systems - 8K Static RAM Board
This looks like a relatively straightforward S-100 static RAM board. 

The board utilized the standard (at the time) 1KX1 21L02 RAM chips.  The board recognized the Phantom S-100 line (pin #67).  The board itself could be addressed to any 8K boundary in the 64K address space.

The rather simple but adequate manual with the schematic can be obtained here.

 

16K RAM   32K RAM    64K DRAM    80186 CPU    FDC 400    FDC 930    HDC    IO Board    Z80 CPU  
8K RAM   4 Line Serial     CPZ 4800   LANS100    CPS-Q6A   CPS-MX   CPX-BMX   QIC Tape Controller   Other Boards