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8-bit acorn hardware • Re: Beeb with no V-Sync on 6845

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Check IC26/74LS139 and IC24/74LS138 and IC20/74LS139 - make sure the levels are good and not contradicting other outputs - the selection of an IC at the time memory is being read creates similar repeated garbage.

BTW: the capture, were you using the test ROM or the OS?

Statistics: Posted by maniacminer — Thu May 23, 2024 11:50 pm



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