Digital Research Computers -- 32K EPROM Board
This was a useful 64K Static RAM board. It came late in the S100 Bus era but was well done.

The board had the following features:-

 

FULLY S-1OO IEEE-696 COMPATIBLE!

USES THE POPULAR 24-PIN "2714" STYLE 2K X 8 RAM DEVICES

ON BOARD EXTENDED ADDRESSING

BOARD ACCESS TIMES UNDER 250 NS. (WITH 200 NS, RAMs}

ALL DATA AND ADDRESS LINES WERE FULLY BUFFERED

FULL AND HALF PHANTOM WAS AVAILABLE

LOW POWER DISSIPATION (< 500 MA. TYP.)

THE TOP 8K COULD BE DISABLED IN 2K BLOCKS TO ELIMINATE CONFLICTS KITH OTHER MEMORY THAT HAY BE OCCUPIED BY SYSTEM MONITORS, DISK CONTROLLER ROMs, ETC.

RAMs AND 2716 STVLE EPROMS WERE FULLY INTERCHANGEABLE ON ONE BOARD.

NO WAIT STATES WEW NEEDED (4 MHZ Z-80 OPERATION IS STANDARD)

The manual for this board can be obtained here.