MegaSTE repair

atari030 · Post by **atari030** » 22 Feb 2024 02:07

I've been dabbling with this on and off in between (a lot of) other projects and narrowed all the issues down. A mate gave me a few bits and bobs from his Atari horde last year. Amongst them were some MegaSTE spares. I happened upon a post from Frank where mentions cache issues. I replaced U3 and U4 and it fixed the random crashing. It still crashes and has issues with 16mhz Cache enabled but no longer at 8Mhz.
The CPU socket is also pretty dicey, and, the source of the blitter problems. It needs replacing. I suspect U8 and U9 also need replacing but I need to find a source for them. Probably socket them first. Little bit of pot noodling around but the end is nigh.

frank.lukas · Post by **frank.lukas** » 22 Feb 2024 12:01

I had installed gold-plated Atari PLCC sockets from BEST ...

atari030 · Post by **atari030** » 22 Feb 2024 23:38

Thanks Frank. Being in Australia, Best is a daunting thought. I noticed Arne has some and there is always the funky adapter option too. I need to get some bits and pieces from the Exxos store anyway.

atari030 · Post by **atari030** » 23 Feb 2024 03:49

I forgot to ask, is there a known good source of replacement tag ram for U8 and U9?

kodak80 · Post by **kodak80** » 23 Feb 2024 23:14

atari030 wrote: 22 Feb 2024 02:07 I've been dabbling with this on and off in between (a lot of) other projects and narrowed all the issues down. A mate gave me a few bits and bobs from his Atari horde last year. Amongst them were some MegaSTE spares. I happened upon a post from Frank where mentions cache issues. I replaced U3 and U4 and it fixed the random crashing. It still crashes and has issues with 16mhz Cache enabled but no longer at 8Mhz.
The CPU socket is also pretty dicey, and, the source of the blitter problems. It needs replacing. I suspect U8 and U9 also need replacing but I need to find a source for them. Probably socket them first. Little bit of pot noodling around but the end is nigh.

I have some sockets pulled from old motherboards if you still need sockets. :)

atari030 · Post by **atari030** » 23 Feb 2024 23:34

Cheers Rob, that might be a good option.

atari030 · Post by **atari030** » 17 Mar 2024 22:57

I have found some comparators on ebay Germany. Does anyone know if 35's will be fast enough?

https://www.ebay.com.au/itm/160847458427

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MegaSTE repair

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