Seattle Computer Products -- 16K RAM Board
SCP had a number of variations of this 16K Static RAM
board. The board was in fact an evolution from their first 16K RAM board
the SCP-101C that also utilized TMS 4044 RAM chips.
There was the above "Standard" board as well as a "16K Plus" board
There was also something called the APEX2 board. It presumably was
the "ultimate" 16K board in the series. Note the jumper for "TOP 1K DISABLE"
(bottom center of board) for example, no doubt to coexist with a boot ROM on the
Its not clear to me
what the other differences between these board versions were. If somebody knows please
let me know.
The boards all utilized 4KX1 TMS4044 or MM5257 RAM chips.
The 16KPlus board used the Cromemco style (port 40H) bank select feature. The board could be addressed in 4K blocks on
any 4K boundary. The board could be configured via a dip switch setting to
come up after power on clear with bank select mode on or off. Software
bank control was done by outputting to port 40H. Unusually, the board used
"bus bars" to distribute the ground lines to the RAM chips.
teh APEX board was very similar except the board select poart could be
any one if 256 selectable ports but is could be configured only to 16K
The manual for the 16K Standard Static RAM board can be
The manual for the 16K Plus Static RAM board can be
Other Seattle Computer Products
8086 Support Board
16K (107A)RAM 16KRAM
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