On Wed, Sep 27, 2017 at 4:24 PM, Francesco Messineo <email@example.com> wrote: > looks like UF6 is bad, it doesn't output the VRAM Write signal (TV RAM R/W), its > inputs are correct, so I'm going to replace it. 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. > yes, I'm using petester since it cycles writing and reading to VRAM so > it's easier to probe around. I haven't fiddled with those ROM images. I just grabbed them from zimmers.net. Not much code there - just a couple hundred bytes and, of course, the vector addresses at the top. I should disassemble them to see what they are really doing. Does anyone know where they came from? I see upload dates from 2015. > Let's see what happens when I replace UF6. Good plan. -ethan Message was sent through the cbm-hackers mailing listReceived on 2017-09-27 23:00:02
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