3 ms·
Not sure about keyboard but video on the ZX81 was achieved by way of a shift-register and the CPU was clocked short of 4MHz just so that it could keep this fed
by rusk 7y ago
Not sure about keyboard but video on the ZX81 was achieved by way of a shift-register and the CPU was clocked short of 4MHz just so that it could keep this fed at the right rate. Check out the 8-bit Guy's video on the topic: https://www.youtube.com/watch?v=1Jr7Q1yJOUM https://www.youtube.com/watch?v=1Jr7Q1yJOUM