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Parallel Port Controller (Hill Robertson)
| These photos show the initial process of building the parallel port controller. The controller can handle up to 320 individual circuits. It can easily be expanded for greater capacity. The board consists of Flip-Flops and Decoders. |
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| Here is the view of the bottom of the board (wire wrap side). |
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| This is a closer view of the ICs on the controller board. Each row controls 8 chips with 8 bits each for a total of 64 bits per row. We have five rows, which gives us a total of 320 bits. |
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| Here you can see the wire-wrap job done on the bottom. All wires were initially red during the testing phase of the first 64 bits. Then, for row two and on, red was for power, blue was for the databus, and white was for the signal leads. |
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| This shows the beginning of the 40 port grid full of DB-9 connectors. Each one of these connectors controls one of the 8-port circuit boxes. |
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