Some update.
While I have totally given up trying to fix this board, I was searching for some replacement. Finally I found some cheap strudy 486 setup with similar motherboard. It's an older ASUS VL/I-486SVGO that came with 486DX2ODPR and 4mb RAM onboard.
The good thing is that the board works.
I thought I could try to swap BIOS chips and see what happens. Here is what I found out:
- VL/I-486SV2GX4 BIOS that I have burnt to an old chip works with the other board - the board, however, keeps resetting after memory test is completed (where the table should appear) - can you tell me what BIOS can I use to get 5x86 support? (it's 1.2 revision...).
- on the other hand, VL/I-486SV2GX4 still woun't post with BIOS chip from VL/I-486SVGO. IMO this confrims that the problem is not related to BIOS.