DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| Close-up view of the wiring of PIN
21 of the General Instruments GI 250 and GI251F Chips. Die Photos courtesy of Sean Riddle GI 250 (left) using PIN 21 as [↔] Toggle Key to select between displaying the lower or upper four digits of the 8-digit Output Register. GI 251F (right) using PIN 21 as Upper Digits Enable signal to indicate if the lower or upper four digits of the 8-digit Output Register are output.  |
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