RetroChallenge board almost working!

Not everything is installed, but the power supply, data hex LEDs, most of the switches, and the composite video output are working.


The switch for data bit 3 doesn’t work because I wired it to an analog input pin of the Cmod-A7 module, and the FPGA internal pullup isn’t enough when the switch is on (open) to overcome the 2.4K series resistance on the module and bring the signal up to a logic 1.

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