That is my first motherboard with VESA interface. Had no PC`s in with VESA in early days. But that may be explained by that I somehow had a gap in my PC career, I have actually skipped 486, and VESA interface is basically 486 thing and it depends on 80486.
LED was not showing all of the segments. My guess was it was just an colder soldering joint, and I was right, after going over all contacts on led pcb with soldering Iron – it was fixed.
Bios IC used in my 486-VIO-IO motherboard was 27C010A-15