Millennium bug.

[flaviosr]

I'm surprising that a 486 BIOS has this problem ... Leap year bug is common (2000 it's a leap year) but I have several 286, 386 and 486 (all with different AMI (flex/win)BIOSes) and none of them have this problem.

If you cannot solve your problem using only software you can always try one of these Y2K cards:

https://www.ebay.com/itm/Y2K-Year-2000-BIOS-Fix-Update-Card-ISA-NEW-IN-BOX-Rare-/232084622599

https://www.ebay.com/itm/Y2K-Year-2000-BIOS-Fix-Update-Card-ISA-QTY-3-pcs-RARE/333005550586?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20160323102634%26meid%3Db3d6bd6441af4c2198b744f6939a8362%26pid%3D100623%26rk%3D2%26rkt%3D6%26sd%3D232084622599%26itm%3D333005550586&_trksid=p2047675.c100623.m-1

https://www.ebay.com/itm/Y2K-fix-BIOS-for-ISA-based-PC-BIOS-Y2000-PS-TESTED/253973965144?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20160323102634%26meid%3Db3d6bd6441af4c2198b744f6939a8362%26pid%3D100623%26rk%3D3%26rkt%3D6%26sd%3D232084622599%26itm%3D253973965144&_trksid=p2047675.c100623.m-1

I, personally, have never used one so I don't know if they really work or not.

Suprise!!! Surprise!!! I will try by sure... thank you!

 

[Chuck(G)]

I'm surprising that a 486 BIOS has this problem ... Leap year bug is common (2000 it's a leap year) but I have several 286, 386 and 486 (all with different AMI (flex/win)BIOSes) and none of them have this problem.

You lost me there--I'll readily admit that 1900 and 2100 are not leap years, but 2000 certainly is and obeys the "divisble by 4" rule. So, what was the problem with 2000?

 

[dieymir]

You lost me there--I'll readily admit that 1900 and 2100 are not leap years, but 2000 certainly is and obeys the "divisble by 4" rule. So, what was the problem with 2000?

The problem is that old AMI BIOSes returned to 1900 at 01/01/2000 00:01 This happens with ALL post-2000 leap years not only with 2000. I did not explain this very well ...

they even tried to make money with its own bugs ...

https://ami.com/en/tech-blog/from-the-ami-archives-panic-like-its-1999/

Finally, the Year 2000 BIOS Enabler resolves potential problems with the leap year for 2000 and subesequent leap years."

 

[Chuck(G)]

Hmmm, I don't recall that one. Must have been selective, depending on model.

Simple enough to resolve with a TSR or the like, however.