Dual Systems -- EPROM-32/64K EPROM Board
The EPROM-32/64K EPROM/ROM board provided for permanent
(non-volatile) storage of up to 64K bytes of data, The sixteen on-board
sockets accept either industry-standard 2716 or 2732 EPROMS.
The EPROM-32/64K could also be used as a RAM board when type 6116 RAM ICs
are installed, in place of 2716 EPROMS. RAMS and EPROMS (type 2716 only)
could in fact be mixed, allowing the board to function as a 32KB RAM/ROM
Depending on the state of the SXTRQ (sixteen request) line on the IEEE
696/S-100 bus, data could be read from the EPROM-32/64K board either a byte
at a time, or as 16-bit words. EPROMS/ROMS were installed in pairs, one in
the upper row on the board, and one in the lower row. When a 16-bit data
transfer was required, the most significant 8 bits were read from one row
while the least significant 8 bits was read simultaneously from the other
row. If an 8-bit transfer was required, data was read from either the upper
row or the lower depending on whether A0 was high (ODD ADDRESS) or low (EVEN
There was extended memory addressing through 24-bit address lines as well as
standard 16 bit addressing. The board was switch selectable to any 4K
boundary. An on-board wait state generator allowed the board to function
with clock speeds from 2-8MHz.
Note the picture above shows the board without the battery power standby
I cannot locate a manual for this board. If you would like to share one
please let me know.
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