The board is an OEM of the Tekram TRM-P5T30-B4E. The Impression TX533 bios string is i430TX-2A59ITG9C-00. This is the last update for it. The file will work for either board. Install with the Award Flash program awdflash.exe, available with instructions from http://sos-hardware.windowstothemax.com/biostar/biosupdateprocedure.htm as of the time of this submittal. Worked fine first time. I'm running WinXPPro on 2 PC-100 x128MB DIMMS (board maximum) with no problems other than speed (a 233MMX is rather overworked in this setup). My thanks to "Kolobos" for the tip on where to find this one.