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Image of a Rigol DS1202Z-E oscilloscope displaying yellow and blue waveforms on its screen. Various settings and measurement data are visible. The yellow line shows a rectangular waveform, data at bottom indicating 4 MHz signal. The blue line is at 5V, staying flat.

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Image of a Rigol DS1202Z-E oscilloscope displaying yellow and blue waveforms on its screen. Various settings and measurement data are visible. The yellow line shows a rectangular waveform, data at bottom indicating 4 MHz signal. The blue line is at 5V, staying flat.
https://assets.chaos.social/media_attachments/files/112/486/732/358/926/360/original/756c9bfb8c5b3834.jpeg

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root42 (root42@chaos.social)'s status on Sunday, 26-May-2024 01:50:38 JST root42
in reply to

Also good news: RESET goes low, then high and stays high on the first 6502.
However: the clock signal is 4 MHz!
The CPUs are supposed to run at 1MHz. However IIRC the clocks are supposed to be phase shifted so that the 6502s take turns in accessing the memory, as the 4KB are shared.
So something is iffy with the clock generation.

In conversation about 6 months ago from chaos.social permalink