First post, by whitepawn
I couldn't help myself and bought another single board computer which labeled as PC420-G2 by protech company. Here is SBC page in 1997:
https://web.archive.org/web/19970327052802/ht … .tw/ipc420.html
After cleaning the board, installed another cpu Cx486 dx2 66 (because the one came with the board is not original, socket was very loose) it posted with "Bios checksum error".I searched online for this error it seemed either bios rom is corrupted or RTC battery problem.Second one is easy to fix for me so i retrofitted CR2032 to dallas chip but checksum error persisted so i tried another bios ( PSC-486 VER:C Jumper or manual information needed) with it which has same chipset and even bios stickers are the same. Also PSC-486 bios gives same error which i believe i have a jumper setting problem.(Top left bios is similiar bios from my working PSC-486.Bottom right is original bios.)
I can boot from A: drive and tried uniflash but bios chip model seems unknown in uniflash.
Started looking for bios backups online but couldn't find any.Meanwhile i discovered same hardware was labeled as "486/586 SBC Ver:GC".This board is very similiar to my board but also i couldn't find any information about it.
By any chance does someone have manual information for it?Or any advice?
Thanks in advance.