Hi guys, It's early here (5:06am), so please excuse the brevity of my message as I'll be going back to bed for a couple more hours after. I did change out the video SRAM as there were a few left over from the main RAM that were still good. Unfortunately this did not change the problem. Pulling the SRAM completely created a checkerboard effect, but there were diagonal lines strafing through the pattern. I'll test this again because at the time I didn't realize this was a valid testing technique. Pulling the CG ROM takes the image back to its original state, blocks and lines. One thing, late last night as I was briefly poking around with the logic probe, there seemed to be many places where I probed that slightly effected the pixel flicker. I didn't do much testing as it seemed a little random and inconsistent. So maybe as Mike mentioned, it could be a power issue. I have the board out on my desk hooked up to an original spare US PET 2001 transformer. Maybe there is some issue with it being a US version on 100v Japanese power. I think I have a JPN to US power step up converter somewhere, maybe I'll try to find that. Thanks again ZZZzzz... On May 13, 2011, at 4:31 AM, MikeS wrote: > > ----- Original Message ----- From: "MikeS" <firstname.lastname@example.org> > To: <email@example.com> > Sent: Thursday, May 12, 2011 3:28 PM > Subject: Re: PET 2001 fix Part 3 - RAM/ROM board etc. > > >> Looks like the problem is mostly in the fifth character column; wonder if >> that's where the horizontal line was originally? > > D'oh! VERTICAL line of course... > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2011-05-12 21:00:03
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