On Thu, Sep 28, 2017 at 12:17 AM, Ethan Dicks <firstname.lastname@example.org> wrote: > On Wed, Sep 27, 2017 at 4:24 PM, Francesco Messineo > <email@example.com> wrote: > > If the inputs are good and there's no good output, this is a good > candidate. It definitely has a lot to do with selecting the right > data at the right time. indeed UF6 was in a really bad shape. I've substituted with a good 74LS157 and now the video ram gets written correctly. The petester image shows a lot of bad DRAM and the video circuitry is still not working good: on every 8 columns, starting from the first, the character shape flickers. I have excluded the chargen ROM, but I need to go back to the schematic to understand what may be the problem here. Frank IZ8DWF Message was sent through the cbm-hackers mailing listReceived on 2017-09-28 09:00:02
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