ive had this same issue on via chipsets too I have the epox 8ka5a2+ and I have the same problem on that board. I only ever got it to work once on that board and I've not been able to replicate what ever I did to make it work.
i'm using a modern win98 build with many things integrated into it, patches, drivers for newer devices, etc. enthusiasts making these builds. very pleased with its compatibility. try using something similar.
win98 works fine on 1366 platform, there's a guide exist. i'm not even talking about 775, am2, etc.
Hmm ok I’ll have to give that a shot