First post, by GigAHerZ
I have aquired a dead motherboard from Soyo. Looking at stason.org, it seems to be Soyo SY-25N. (There's a sticker with 025N, so i assume, it's the N variant)
https://stason.org/TULARC/pc/motherboards/S/S … SY-25M-N-P.html
Now, i have read this topic: https://www.eevblog.com/forum/repair/how-to-t … scilloscope/50/
And based on that i think, the bios rom is faulty.
With ISA diagnostics card, i can confirm that ISA clock is present and reset isn't held on, so it's good on that side. At the same time, i get "-- --" as the boot code. No beeps or anything else.
Now, when i remove the BIOS chip, i actiually get some hex codes on diagnostics card. Therefore i would assume that the bios ROM is faulty.
Tested with minimum clock speed settings, no ram and eventually no bios nor keyboard chip present.
Bios chip is a PDIP28 chip, silkscreen on MB under it tells "27512". I would assume it's an EEPROM chip? Will any work? What are my options for flashing it?
And first of all, are my assumptions even correct?
"640K ought to be enough for anybody." - And i intend to get every last bit out of it even after loading every damn driver!