BitWrangler wrote on 2022-02-17, 14:01:
On other board/CPU combos, I might think that was a cache thing. Timing problems likely if nothing had gone bad... but all the timings are baked in here.. But, I remember the Celeron Tualatin has slightly different cache arrangements than the Tualatin PIII and released a little later... so could it be possible you have a BIOS with tualatin support, but not specifically celeron tualatin and it's handling the cache wrong???
It's not that, for sure. The board refused to boot up with a Mendocino Celeron (known working), a VIA C3 (possibly faulty?) or a Coppermine Celeron (also possibly faulty?) but it did work with a Coppermine P3 800. However, the problems remained. It is also incredibly picky about RAM it accepts. Regardless, it's a very flaky, and frustrating board.
One thing I noticed is that almost all problems happen in games that run in protected mode or with their own memory managers of some kind, ie. Doom, Quake etc. I am guessing the BIOS on this board does something wonkny with memory management, probably due to reserving memory for shared VRAM and AGP Aperture, that messes with memory management for these titles. I've come to the conclusion that PLE133T is a way too advanced platform to build a DOS PC around, so I am going to try my luck with an MVP4 board instead.
Fingers crossed..
Retronautics: A digital gallery of my retro computers, hardware and projects.