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Cromemco D+7A I/O 

The Cromemco D+7A I/O board was a very specilized board produced early in the company history to allow the use of two Joy Sticks to be used with their Dazzler board. However it was a very powerful and useful general analog to digital converter board.

Cromemco D+7AIO

The board provided one digital and 7 analogue input/output ports to be utilized.   The board was completely port addressable with the lowest port being the digital parallel port.  Cromemco software uses ports 19H to 1FH.  The analogue to digital conversion was done using a MC 1408L D to A chip.  The seven analogue ports each had a range of -2.56 volts to +2.54 volts. The voltage is represented as twos complement with the least significant bit representing a 20 millivolt increment.
There was an excellent discussion/write up about this board in the July 1997 Interface Age magazine.
That article can be obtained here

Other Cromemco S-100 Boards

ZPU  SBC   4KRAM  16K RAM  64KZ RAM  64KZ-II RAM  256KRAM  8KBytesaver  Bytesaver-II  
16KPROM  32K Bytesaver  4FDC   16FDC  64FDC  WDI  WDI-II   STDC  DPU
4PIO   8PIO   TU-ART  D+7A I/O   Dazzler  PRI   GPIB Board   XMU  XXU  Other Boards


This page was last modified on 10/25/2013