I recently purchased from Ebay one of these little 486 boards, mostly to have a backup 486 motherboard in the unfortunate scenario of my Lucky Star LS486e rev D dying.
I found as many have before that the latest available bios 400a has a few issues like ps2 mouse not working, hanging on either the hdd identification or
PNP listing during post. The problem I had was that it hanged at the hdd id part and wouldn't identify my 40gig hdd.
I have run the 400a bios through Bios patcher and re-enabled the ps2 mouse port in modbin.
Everything appears to work ok, ps2 mouse works in dos and win95, serial mouse works dos and win95. My 40gig hdd is properly setup in the IDE auto detection.
It doesn't hang at the PNP listing, so all good. I have uploaded my 400a bios if anyone wishes to give it a go.