GroovyDrifter

Sorry for bumping this year old thread, but with old computers, issues appear more often as time passes, so... I've just done it with no luck I've removed and socketed the DMA ic and then applied the fix over it (so in case I find a good DMA chip I can replace it without taking the full computer apart again). It is an Atari 520STE, motherboard CA4003290, bought from UK, with the same fix applied that this one from Atari Wiki: The DMA chip is the C025913-38 one. I have a STFM with one of those working perfect, and a spare STFM motherboard with that same chip where I try things, also working with no issues. This board, this particular unit at least, is very problematic... I had to replace the colour transistors as sometimes one colour, usually blue, faded slowly and disappeared, leaving a Yellow/Green desktop; replaced all four simm sockets (and installed 4MB RAM)... and still gives sometimes bombs at boot time (yes, I'm the guy that contacted you by email regarding the Mitsumi SR98 schematics). I know it's not a power issue as the PSU has been recapped (used the values and make you suggest in your web) and the chopper transistor and rectifier bridge upgraded... and tried two different ones (both fixed). It surprised me that the ROM were already socketed and that one of the ROM/EPROM type configuration jumpers was missing, and fixed with a permanent board trace (I replaced those with jumpers), none of my previous STE had this (I have two more, I like to fix and upgrade computers, not a reseller of any kind..) I've seen that I've not been the first one trying to fix this board as there is burnt flux over several components pads. He replaced some of the capacitors... two under the PSU were too tall an the PSU tilted over them, I changed them with tantalum ones as they are shorter and now it sits over the four legs. I'll probably try to swap the DMA ic with the one in the spare STFM board to make a crossed test. I'll usually replace all elec. capacitors first, but this Ataris have too many. If I had a spare DMA chip I'll surely recap it before replacing the DMA (one or the other or both will fix it) but otherwise it feels like a 90% probability of throwing more money away...

Oh, man, I can't wait to have mine, hehehehe

Good!

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