jasa1063 wrote on 2022-08-21, 20:57:
I installed a 486DLC that I had extra just to try it out. The system will not post. I determined jumper J4 is to switch between 33 & 40 MHz. I tried switching J5 but that did not change anything. At this point I am just going to leave well enough alone and run it as a 386/40 MHz system.
Does your board still work without a socketed CPU?
I have version 5.4, which is very similar. On first look, I can only see differences were the pin headers are.
Reason I ask: I tried to put a 486DLC and a 386DX40 in the socket and I had problems.
What I did:
1. run benchmarks on the board when I got it - everything worked, phils suite ran completely, twice.
2. put a socketed CPU (another AMD 386DX40 and a Cx486DLC) - not work....I think the DX posted, but was unstable, but I don't recall if DLC POSTed.
3. removed socketed CPU - MB POSTed, but re-ran benchmarks and they locked soon after boot
4. removed soldered CPU - either socketd CPUs would POST but still froze in DOS
So my conclusion is that the chipset was damaged due to 2 CPUs in parallel. I'm actually looking for a motherboard to take it's chipset (I'm obsessed with the small footprint, like M326, so if I find a larger donor board....)
I see in your photos it says SARC RC4018A4 on a sticker (which I found on your V5.3 and also a V5.5 photo), but I don't have the sticker and it says PC CHIPS 11 (and the smaller chip is 13). I have the same dimples on it (2 big ones on the diagonal of pin 1).
So a big warning against trying again and also I want to find out what actual chipset is used, as I know that most PC CHIPS 386 products are relabeled.
So, anyone can confirm SAR RC4018A4 == PC CHIPS 11 ?? Also, what other chipsets are direct replacements? I'm willing to try.
Edit: based on dimples, I see ALI M1429 (A1) and Bioteq 82C3491 with the same pattern. Anyone can confirm they're the same chip? Again: THIS IS BASED ON PHYSICAL PACKAGE.