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Atari ST520FM Boot problem.

Problems with your machine in general.
Steve
Posts: 3273
Joined: 15 Sep 2017 11:49

Re: Atari ST520FM Boot problem.

Post by Steve »

Yeah diag cart gives ROM CRC error normally, because it's based off a different TOS ROM to the one you are running.
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olivier.jan
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Joined: 01 Jun 2020 08:00

Re: Atari ST520FM Boot problem.

Post by olivier.jan »

If you’ve reseated the IC I would suggest taking them out one more time and check that no pin is bent. Depending how you remove them or if you mistakenly insert them with a slight angle you might bend the pins. Once bent you end up with a short which is not visible when inserted in a socket. (I’m talking about the PLCC chips)
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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