Found some inaccuracies in the specs of the Aopen 6VIA/ZX85 (6via85): http://www.win3x.org/uh19/motherboard/show/7956
- the motherboard supports FSB 66/100/133(OC)--> page only lists FSB66/100
- it supports Celeron (Mendocino), Celeron (Coppemine) and Pentium III (Coppermine) --> page only lists mendocino celerons. 133MHz CPUs will work but you need to manually configure the AGP/PCI/FSB divider to run PCI at 33Mhz witch is done via a jumper located near the ISA slots witch on some boards is unpopulated.
The Acorp 6VIA85P (http://www.win3x.org/uh19/motherboard/show/7957) officially supports 133MHz FSB.
- it also supports VIA C3 Samuel chips.
Both boards are silkscreened 6VIA / ZX85, and the only way of telling them apart is looking at the northbridge (VIA VT82C693 or VIA VT82C693A for the FSB133 version). In some (rare) cases there will be a sticker over the silkscreen that reads "6VIA85P" for the Apollo 133 version
The on-board sound card is optional - only seen one board with it out of the dozens that pop up where I live, and it requires a breakout cable.
I have two of these lovely little AT boards and tested them with all of the above without updating the BIOS. One is running a VIA C3 800A (incorrectly detected as 800B at post - probably a typo) and the other a 1000MHz Pentium III Coppermine (133MHz FSB).
It should be noted they are prone to capacitor rot, particularly the 1500uf 6.3v caps near AT power connector. Dead boards might be revived by recapping.