First post, by 386SX
Hello,
today I found this untested board and as usual it doesn't boot. It's an unknown "UB433-DAVE REV1.1" board with an ALi M1429 A1 chipset plus another one I can't identify cause the sticker is difficult to remove (should be the ALI M1431 A2). Eight 30pin simm, 256KB cache 20ns already installed., three VLB, classic design I'd say for 5V only 486 cpu maybe up to 66Mhz/100Mhz probably. There's an after market sticker seller that doesn't mean anything but on the back of the board there's the code E119697 printed inside the layer of the PCB with the UNIC name.
Usual Amibios 486DX ISA 1993 12,5v VPP UV erasable bios, many jumpers but don't know what they are for. The board doesn't boot in the config I found it, a 486DX-33, tried different ram, different cpu, DX, SX, DX2, different ram sockets, different cache tag, ISA vga or a VLB vga on first VLB socket, no way. Removed the old battery put that large one, the only one I got until I find the config to use the external pin. Cpu, chipset, cache, everything seems to warm up (cpu first of all) when the AT psu is running but no video signal.
I found a very old online discussion with same questions but they had the bios boot number "40-0212-001235-..." and it point to the Formosa Industrial Computing (FIC) company. The only similar but not identical board I've seen online seems the TMC PAT48AV but the layout is a bit different while the general design is mostly similar but not the jumpers and components are installed in different positions.
Before going looking for an ISA debug card what I can check for? I suspect it may be bios related but I don't even know which jumper should reset it but considering it stayed decades with the battery @ 0 volt I'd imagine it's not the problem here.
Some photos attached for your opinions eventually. Thanks!