I've been working on documenting Atron's hardware debugging products http://bitsavers.org/test_equipment/atron But haven't found any software or documentation for the PC products anywhere. I just bought a later-model AT Probe, and it would be nice to find the bits to be able to use it. I haven't …

No, positively absolutely BOTH boards were stuffed with the WRONG chipset No other part from other vendors functions the same as the 82C406. The parts put down on the boards were WRONG Now, I have to figure out all of the missing jumpers and try a BIOS for the correct chipset. I have one from a …

In the process of doing a chip swap, this is what was found under the parts. so as I suspected BOTH boards have the wrong parts

well, I was updating the VIA datasheets section on bitsavers this morning, and discovered that the 100 pin part seems to match the pinout of their 82C416. The description seems to match the functionality as well. so BOTH boards have the wrong parts ??? wish I could find info on the 406

I just made a table of 100 pin integrated peripheral controllers http://bitsavers.org/projects/486_motherboards/100pin_integratedPeriphCtlrs.txt I'm pretty confident the memory controller is a SiS 471, from tracing out power and ground on the 100 pin part that it isn't a 407. Just to verify the 407 …

well, I keep poking around and looking at pictures based on parts used and layout, it really seems like it is a Soyo board, but nothing quite matches it in https://web.archive.org/web/20010619055022if_/http://www.soyousa.com:80/manuals/486/25J-MU43.PDF it was probably a 20 series, but earlier than …

I think this is going to just be a dead end that goes in the scrap pile. I could try swapping out the two ASICs and populating the cache ram and jumpers to match, but then there is the problem of the unknown BIOS. It did also point out there are no data sheets online for the SiS 85C407

There are 895 and 895A parts, the same as 602 and 602A. There is an addendum describing the 602A but I couldn't find anything for the 895A I'm going to check power and ground pins to see what my parts use and if they match with the SiS471 . It hadn't even occurred to me the A rev part might be a …

I posted about this on Twitter, and someone replied with https://www.vogons.org/viewtopic.php?p=843505#p843505 "Another SIS471 — no BIOS chip." So, it looks like someone went through a lot of trouble to put another chipset on my board The OPTi and SiS don't appear to be pin compatible, and the one …

Has anyone ever seen a board like this before? No manufacturer, no 8042 keyboard controller and no obvious CPU clock generator. Of course, all of the jumpers and cache rams are missing too and OPTi not the disk controller company OMTI are there any OPTi 895 motherboard schematics out there anywhere? …

Necro posting to add this bit of information I just picked up the manual and software off of ebay that i'll be scanning and putting on bitsavers, but it turns out you also need an external interface pod https://www.ebay.com/itm/291098579447