So this is over the span of a few days as I've been trying to get this thing to work for a little while and life gets in the way etc (dang work!)
I recently purchased a single board computer, the AP-520 from 'Industrial Computer Product'.
I didn't realise at the time that it would come with everything originally packed with the board - the IDE/Floppy leads, keyboard lead and PS/2 to 5 pin DIN adapter, manual, etc. That was a pleasant surprise enough, however...
The board was still sealed, as new, in the anti-static bag it was originally placed in those many years ago! Amazing! I haven't seen a 'new' socket 7 motherboard in so long, this was icing on the cake 🤣
Anyway, I really wanted to try this thing out, so I grabbed my old junked ISA riser card (from a Commodore 386 no less...) and carefully wired up AT power lines to the board.
Despite testing the wiring and so on, the board refused to POST. Nothing I tried worked. I thought maybe the CPU or RAM was bad, tried replacing those, no juice. It really had me stumped.
Anyway I left it for a couple of days as I thought it over more, and just last night I came back to it and I instantly realised I had not tested the CMOS battery... which turned out to be absolutely dead (it didn't even register on my admittedly shitty multimeter).
So I replaced the CMOS battery with a new CR-2032 holder and fresh battery...
Turned it on...
And it POSTs first go!!
Now I need to figure out a way to make a small case for this, something nice and portable. It'll make for an interesting x86 system!