Atari 520 with Glitches

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mpcruz
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Atari 520 with Glitches

Postby mpcruz » Tue May 16, 2017 11:48 am

I got an Atari 520STfm and a 520STe that are with a strange behavior. I have a pack of games that I use to test the Ataris and some games are crashing the Atari screen. I have some pictures of the crashes:

F29
Image

MIDNIGHT RESISTANCE
Image

DRAGON SPIRIT
Image
Image

This games I have teste on others 1040STf and 520STfm and they ran with no problems. I have tested too, just to know that the game disks are fine, all the games on Hatari with TOS 1.00 UK and 512MB and everything ran fine. Then I converted the disks to .ST and sent to a friend that tested on his 1040STf and it ran with no glitches.

Any idea about this????

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Greenious
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Re: Atari 520 with Glitches

Postby Greenious » Tue May 16, 2017 3:21 pm

Try reseating the socketed chips (and simms in STE).
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mpcruz
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Re: Atari 520 with Glitches

Postby mpcruz » Wed May 17, 2017 12:57 pm

Do you mean the memory chips? On the 520STfm they are soldered and on the 520STe, I removed the SIMMs and reinserted but same problem.

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Re: Atari 520 with Glitches

Postby mpcruz » Wed May 17, 2017 1:21 pm

I removed on the 520STfm all chips that are socketed and reseat again. Same thing on the screen :(

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Greenious
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Re: Atari 520 with Glitches

Postby Greenious » Wed May 17, 2017 2:41 pm

Well, the perfect tool to test your ataris at this point, since it boots, would be to use a diagnostic cartridge.

Have you got the service manuals for your ST's? (http://dev-docs.atariforge.org/)

What's the history of these Atari's? Have you had them all along, ie they did work and suddenly got problems, or did you buy them in this state? The more you can tell, the better. I find it kinda strange that both exhibit the same behaviour. Have you looked closely inside them, is everything "original" or is there any sign at all of added/removed hw? Used any non-working addons with both that might have broken them?
Updated my guides as of june 28th, 2016. Check'em out and feedback!
viewtopic.php?t=5040

mpcruz
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Re: Atari 520 with Glitches

Postby mpcruz » Wed May 17, 2017 10:39 pm

Where I can get the best diagnostic cartridge?

These two are new Ataris for my collection. Sometimes it bombs too. Very strange behavior.

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Re: Atari 520 with Glitches

Postby dlfrsilver » Thu May 18, 2017 8:19 am

seriously, first, you must service them before using them. If the PSU have not been recapped, do it. same for the motherboards.

If you still have any problem, then the capacitors will be ruled out.
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Re: Atari 520 with Glitches

Postby mpcruz » Fri May 19, 2017 4:51 am

After some tests, I think the problem is with the disk drive. This is not an original drive. It was replaced with a Chinon FB-354. I swap for other ones and the games don't have this glitch anymore. Maybe a DMA problem?

mpcruz
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Re: Atari 520 with Glitches

Postby mpcruz » Fri May 19, 2017 3:04 pm

Thanks to Exxos that helps me to find the solution!


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