This was an early Jade RAM board.
Jade Computer Products - 8K Static RAM Board
There was nothing particulary special about the board. It had the S-100
Phantom line and could be addressed on 4K or 8K boundries. It utilized 21L02
RAM chips, drawing up to 2 Amps from the bus.
The manual for this board can be obtained
8K Static RAM
Z80 CPU 64K
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