"M-14" would actually end up on NUMCLK2, which makes obviously no sense at all. A-13 is FERR on the 487SX. So it looks like 1-2 is meant for 486DX (connect 486DX FERR# to mainboard FERR#), 2-3 is meant for 487SX, and no jumper installed is for 386/387. I'm probably miscounting, but wouldn't 486-M14 …

Also seems odd that the memory bandwidth changes from ~450MB/s to ~210MB/s on the C1XS between the initial and second run. It is worth trying swapping the RAM over, or have I missed something?

From Stackexchange ( https://electronics.stackexchange.com/questions/248919/whats-special-about-14-31818-mhz ) It is exactly 4× the NTSC color-burst frequency of 3.579545 MHz. Since it is (well, used to be) used in huge quantities in commercial color TV sets, it is both commonly available, and …

I remember using Norton Disk Doctor. It would do a surface scan and mark any bad sectors. Found a couple of references to FormatQM being good for testing lots of floppies in a row. Looks like it's shareware from 1991, $10 for non-commercial use. And they're still around : https://www.sydex.com/ …

Hope the work with the BIOS does fix it. If not, do you have a multimeter? I'm guessing a lot here, but it looks like pin 32 (pin 1 is the one marked on the slikscreen by R63, count anti-clockwise from there) should connect to C51, which goes to ground. Check that there's some resistance across C51, …

May be an issue with the RAMDAC? Sounds a bit analogue-y. If something went wrong with the Vref (pin 31 on the ATT20C491, from a quick search, near R61 in the photo) for the DACs that might bring down RGB all together so look like a fade out?

Good point, I was just responding to the direct request about whether miniPCIe SSDs existed, didn't think to check what the ports actually are. I haven't followed it closely, but the ports do seem to have ended up a bit confusing to me. I'm looking at a Gigbyte H81N motherboard right now which has …

Yes to SSDs. Look up NVMe stuff. I managed to get one (Toshiba KBG30ZMT256G, sort of a RC100) working in my Dell in the WLAN spot. Of course the BIOS doesn't support NVMe so it won't boot from it, but other than that it works well[1]. You might need to watch out for the lengths, and potentially the …

Nicely done. I'd seen the header when I cracked open the case of my Athlon recently[1], hadn't realised what it could be used for. I suspect mine won't overclock much (early model and the actual chip is marked as 500MHz) but might give it a try. I got curious about what the other bits of the …

Don't know if it's related (it's not a restart issue as such), but I was just reading this: https://en.wikichip.org/w/images/9/90/AMD_Athlon_Processor_Model_1_and_Model_2_Revision_Guide.pdf and (on page 9) there was apparently an issue involving cache corruption, specifically with Win98 suspend/ …

Yeah, normal holes are fine, the ones I have a problem with (only mentioning because I had fun with this recently) are those connected to power planes. When there's a slab of copper on both sides then after removing, e.g., a capacitor I often find a plug of solder remains and getting it to melt all …

Probably bad form to follow up my own post, but I had a play with what I think is a phase control for the buffered clock and it has improved things. The 512MB PC133r stick that I have kept failing Memtest86+ when running at 133MHz/CL3. It was only on the Block Move test, but a fail is a fail. The …

Gbeirn, I don't think the ECC bit really matters. I'd expect a motherboard that doesn't support ECC would just not read the extra 8 bits. The bigger problem is this business of registered or non-registered. I believe most server memory is registered (makes timings more reliable and reduces load on …

[edit: probably useful to note up here that I eventually figured out that all I'm doing is using the REGE pin 147 for its intended purpose, to disable the register function, but keep the signals buffered] (Short version: I accidentally got some registered RAM and converted it to unregistered) I've …