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Andrew B

One of the flip-flop outputs of the A1 Scaler takes an entire day to change states - the AGC used the slower flip-flops as a 28 bit binary counter to measure time.

Once I got to 50 seconds per division in my oscilloscope it was taking forever, so I am using my Propeller 2 board to read the last/slowest 16 bits the same way the AGC would have, then I can log the data in a serial terminal for a day and watch it count upward from 0 to 65535.

The A1 Scaler board for a 74HC implementation of an Apollo Guidance Computer, sitting on a white ESD mat. 16 of the IO pins are hooked up to a Parallax Propeller 2 evaluation board using multicolored header pin jumper wires.
#retrocomputing#apollo#agc
Jan 26, 2023, 05:01 PM·Public·tooot
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