Oh now this is getting a bit disappointing.<\/p>\n
It was a bit too much to think the tri-state buffers had failed and changing them one by one made no difference. Hmm.<\/p>\n
I think that the screen memory is OK because the noise on the screen shows each of the bits both set and cleared so no sticky bits either high or low.<\/p>\n
I wrote a noddy program and blew ROM just to clear the video RAM and nothing else. It didn’t fix anything but, on reset it tends to look a bit different. I’m not sure what any of this means.<\/p>\n
Sometimes I do wish I could get an old machine and it would just work.<\/p>\n
Never mind. More next time.<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Oh now this is getting a bit disappointing. It was a bit too much to think the tri-state buffers had failed and changing them one by one made no difference. Hmm. I think that the screen memory is OK because the noise on the screen shows each of the bits both set and cleared so … Continue reading RetroChallenge 2017\/10 \u2013 Mid challenge – all the red herrings.<\/span>