<> I have five 486 boards that hae older RTC that roll over from 1999 to 198 <> they do however set manually to 2000! < <Is this the clock chip (I would be _very_ supprised if it were the <case), or how the BIOS/OS reads the chip. In these cases (early 486s) the bios is reading a chip with a known bug. <Now, some PC BIOSes/OSes will take an invalid (too early) year as being <1980. So the clock rolls over from 1999 to 1900, and the _software_ <changes that to 1980 (as otherwise it's too early a date). That's why you <can manually set them to 2000. A few chips were designed that way, as their date of origin was later than 1980. <The chip itself is working correctly (as designed). The software is <misusing it ;-). The one on my s100 board is definatly broke... I wrote the bios! Allison