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Atari 520 STf - Corrupted graphic and Red Screen with Diag Cart

The place to ask all those likely daft questions!
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jurassicman
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Joined: Thu Jan 26, 2023 7:08 pm

Re: Atari 520 STf - Corrupted graphic and Red Screen with Diag Cart

Post by jurassicman »

Ok... I did find in a box a Null modem Cable lying around so I plugged it to my PC, installed minicom and actually it seems to work.

I did test the RAM and it's ok. When I did the test the color on the Atari monitor changed from Red to Blue (during test) to Green (once finished). Still no text on the monitor, though. Roms are ok as well and checking audio I can hear the sound (as i can when I load Lemmings). I also can see the colors on the Atari Monitor.

Which tests should I do?
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stephen_usher
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Re: Atari 520 STf - Corrupted graphic and Red Screen with Diag Cart

Post by stephen_usher »

Run the internal tests, 'Z'

Given that the machine is doing this suggests that the machine is mostly fine but for some reason the SHIFTER isn't reading the memory.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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jurassicman
Posts: 22
Joined: Thu Jan 26, 2023 7:08 pm

Re: Atari 520 STf - Corrupted graphic and Red Screen with Diag Cart

Post by jurassicman »

Maybe this is the error...

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jurassicman
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Re: Atari 520 STf - Corrupted graphic and Red Screen with Diag Cart

Post by jurassicman »

Running internal tests ("Z") I get the same error.

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jurassicman
Posts: 22
Joined: Thu Jan 26, 2023 7:08 pm

Re: Atari 520 STf - Corrupted graphic and Red Screen with Diag Cart

Post by jurassicman »

I did some search on the Web and found some people with similar issues... it's not sure but it seems that the GLUE C025915-38A Chip could be, actually, the cause. What do you think?
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