#RetroDebugging

Shonky Electronics!shonky
2025-06-14

There's something wonky about the reset on my pro.
The reset button on the clock/reset card doesn't make the CPU burst in to life, but the button on the back plane does, BASIC at least, but switch bounce (I assume) can make that slightly erratic. Both produce a low (<0.1v) at pin 26 of the Z80 chip. Also, it looks like the back plane button simply shorts the TTL output from the clock/reset board to ground?


cc @rc2014

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