Back on page 3 in this thread I posted a sorry lot of stuff someone else had found in a dumpster or even more likely in the woods and then sold on Ebay as working parts without any good pictures showing the sorry state of the items.
Among the items were a PC Chips M507 i430FX Socket 5/7 motherboard. It was dirty and rusty and came without BIOS and RTC chips, surprise surprise. I tried to get it going with the help of a BIOS chip marked 586 1995 which seemed to indicate it was for a FX board but when the board diddnt show any signs of life I gave up.
A few days ago I cleaned the board and today I borrowed a BIOS chip from a dead Biostar 8500TAC-A i430FX board and a RTC chip from another dead board, this time I had more luck. The "Bio-Chips M507-TAC-A" posted at once and everything seems to work. The M507 dosnt seem to have any issues with the BIOS transplant, probably because the two motherboards use exactly the same UMC I/O chip. The best thing is that the cache slot works eventhough the Biostar board dosnt have one, this is key as the onboad cache on the PC Chips board is fake. The only reason I can think of that makes it worth to flash the correct BIOS is that is an Award one, the BIOS from the Biostar board is an AMI Win-BiOS. On the other hand the PC Chips board now thinks its a Biostar board which is an upgrade. 😀
The PC Chips boards FX chipset is marked SB82437FX while the Biostars FX Chipset is marked SB82437FX66, I guess they are two different revisons of the 430FX chipset?
The PC Chips M507 as when I got it with the worst crud brushed off.
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The now clean PC Chips M507 with RTC and BIOS chip.
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The Biostar 8500TAC-A - Version 6 donor board.
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Im happy as I now have a 430FX board with a both CR2032 battery and pipeline burst cache, my other 430FX boards use Dallas/Odin RTCs or DIP memory or dont work at all.
New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.