Need help with jumper settings for a US Logic Cardinal (socket 3 trying to run Am5x86)

[Glen M]

Hello everyone, hope you are all well, it's been a while since I've been on here!

As the title says I've got a US Logic Cardinal motherboard on the bench at the minute (https://theretroweb.com/motherboards/s/us-logic-cardinal), it came with an Intel DX2-66 but I've replaced that with the AMD 5x86 P75. Hit a stumbling block though as it will only boot at 100mhz which is confirmed by CHKCPU which shows it running with a 3x multiplier.

My main problem is that I don't have a manual for my specific board and there isn't one listed on the retro web so instead I've been using the jumper table for this ASK Tech board (https://theretroweb.com/motherboards/s/ask-m1487-89-rev-b1) which has more or less the same physical layout. I say it like that as while all the jumpers are in the same place several are labelled differently and I discovered last night that the voltage jumpers for it are absolutely wired different. In any case I've set the jumpers for an AMD DX2 66 and tried the jumper position for the AMD DX4 100 but while it boots and detects the AM5x86 it only ever boots at 100mhz.

Would anyone by any chance have a copy of the original manual for my exact board, or be able to confirm the jumper layout?

 

[Glen M]

might have resolved it, looking through retroweb I've found this motherboard (https://theretroweb.com/motherboards/s/edom-wintech-mp060) which again looks identical but at least this time the jumper settings for the CPU voltage match what I discovered on my board. Won't get the chance to try it until later but I'm hopeful.