Booted it with an ISA POST card, get error FF63.
Which seems to deal with INT 19h

is that without any disk?

Same with disk or without.

Code FF means POST is finished, looking for boot block. Insert an external ISA card (disable the on-board one, if possible), as the on-board one is, clearly, having problems.

I don't have an external ISA controller on hand besides the one in my other 486.

Tried with my ISA card and still doesn't work. Onboard one has no option to be disabled.

Acer m5105 model disk controller chip.

>It glitches out the Energy Star and Award logo after posting

it it was glitched from the start then I would also point at integrated graphic card, but only after completing initialization is weird, almost makes me say corrupted bios? but it does sent POST code indicating it finished correctly so I dont know

this is the board https://theretroweb.com/motherboards/s/dtk-pk … 0062s-ver.-1.00 sadly no bios dumps
JP23 disables build in VGA, test again with ISA graphic card, also go over all the jumpers with https://theretroweb.com/motherboard/manual/33088.pdf

mb bios corrupt

I'm probably gonna give it away to Free Geek Twin Cities since I don't have an EEPROM programmer. Did use the CPU and RAM for my other 486.

could a crossflash work, i know the onboard video will not work, but try to rule out a bad BIOS by using a different EEPROM with a different SiS 461 BIOS

Another idea ? Cache... try w/o cache ?