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My board has a 24 Mhz osc but judging by the markings on some ICs the chipset was rated for 12.5 MHz. That's probably where that number came from.

I have an old Sunshine EXPRO-60 (with ISA interface card and DOS-based software) which can read 8042 and read/write 8742.

I have the same mobo (the PAT-7.2A variant) and it seems to come from an Arche Rival 286-12. In my case it was an easy fix with the corrosion and it's genereally quite easy to work with. I'm going to post some jumper descriptions for it when I'm finished with them. So far I've found the memory...

Hi, yes, my board says "PAT-7.2A" in the corner. Please find the attached BIOS (including the KBC firmware). From what I've found it seems to come from an Arche Rival 286-12 which seems less common than the 286-16 variant and has a different motherboard.

Success! I tested all ram chips (good) and figured out the memory configuration by looking at the datasheet for 82c202 and some beep tests. It's JP8 and JP9. I also found some other jumper functions but I will publish this later when it's more complete. I also dumped the roms including the KBC...

The BIOS hangs at 64k (with code 1F) so I decided to try the Supersoft DIAG. It seems fine so I guess the memory configuration jumpers are wrong. I've got 4x9x64kbit on board and if my calculations are correct it gives just 256kbyte and if the board is configured for 640k, well...? I'll try to...

So, I did some testing and with current jumper settings I got this far using a CGA card. (See screenshot) White cables on the left is speaker and that's as far as I went today with the jumpers. Also, as seen on the right the keyboard connector is still off along with two 1kohm which were a bit...

I have the stand alone card and yes, you need either an RGBI screen or a converter like MCE2HDMI (which I use). It is to a certain degree identical to the original IBM CGA but with all the chips logic crammed into the two CPLDs plus external charrom (EPROM), SRAM and CRTC (MC6845). It even has...

I just got hold of the same motherboard and am currently fixing some minor corrosion damages. I don't have any additional information on the board yet but will perform some tracing on the jumpers to see where they lead. I'm curious, did you get it to POST and did you figure out the jumper...