Was VTech, now PC-Partner. VIB804DS ? If so, there should be a part number on the board,
35-8804-XX and your I/O chip should say "Prime 3" on it. If so it is the LGS version of the BIOS.
Download page at
http://www.pcpartner.com/bios/VIA694.HTM#vpx
[edit]
Latest BIOS contains the following info:
ID string: 06/19/1998-580VPX-PRIME3-2A5LDV3AC-00
OEM string: BIOS-L (80619)