Digital Research Computers -- 128K RAM/EPROM Board III
This was a useful ROM board in that it
could take RAM or ROM together on the same board. It may be the last S-100
board DRC made.
I used this board to hold my version of the IBM PC BIOS. It used the popular
28 pin 2764 style 8K x 8 RAM/ROM chips. Each chip location could be
disabled. It met all the IEEE-696 specifications and so had 24 bit
addressing as well as 8 or 16 bit data paths. You could add up to 7 wait
states. You could set it to byte low or byte high mode for even/odd
addresses. It did support the S-100 bus Phantom
line for input but unfortunately not output (to inactivate othere
overlapping RAM on the bus).
The (short but adequate) manual for this board can be obtained
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