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ENIAC looked like 40 standard telephone company 19 inch relay racks about 8 feet tall laid out on 3 walls of a room in a U shape. 16 racks on each of the long walls and 8 racks on the short wall. 20 of the racks were the accumulators, 10 decimal digits each with 100 neon lamps to display the contents of that accumulator. one rack had a built in oscilloscope, another had controls for manually starting stopping and single cycling the machine for debugging. The remaining racks served various purposes, there were even a couple spare racks with no electronics in them provided for future expansion. In addition to the 40 racks on the walls ENIAC had 3 Function Table units mounted on casters so they could be moved around when needed, an IBM card reader unit, and an IBM card punch unit. There were usually a few oscilloscopes on wheeled carts for troubleshooting hardware problems.

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12y ago

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