In retro build news, my Pentium MMX is finally stable. Biostar MB-8500TTD paired with the custom J.3 patch to fix several bugs with the IDE controller -- and an EEPROM with an actually writable config memory portion -- has this thing rock solid, even at a 75MHz bus. 83 can boot into Windows and run some benchmarks but isn't truly stable the way a 75MHz bus is. Makes sense -- at 83MHz the PCI bus is running at almost 42MHz, that's way out of spec. Even with cards that behave fine with that overclocked bus (my G200 PCI, a 3C-905C) I'm willing to bet the chipset is less than happy at that speed. Still, 262MHz out of a 233MHz CPU isn't bad. Even if I think it would have benefitted from a third multiplier pin a la Super 7 to be able to set a 4x multiplier -- the CPU feels like it's got more left in the tank, but I just can't physically push it high enough.
I'd still rather have a fast Pentium MMX machine than a slow, deliberately hobbled K6-2 or III machine. I have an actual sentimental attachment to the Pentium MMX -- a 200MHz MMX was my very first CPU, and it feels good to have a working machine around one again.
The Matrox G200 is a surprisingly capable card. The TNT2 M64 I also have in PCI was only marginally faster in this machine -- but then, both are probably being held back by the bus and by the CPU. I find it especially fun that I was able to find the VRAM expansion for my G200 online for less than 20 bucks because it was part of a server parts surplus -- the G200 really had a weirdly long history in enterprise. And something I'm running on there can actually make use of the extra VRAM, even -- the Dark Majesty client for Asheron's Call runs here, but at normal settings was complaining about low available texture memory. And there's an actual playable server that talks to the Dark Majesty client now, Aetherium.
Yes, I had to swap EEPROMs to get this thing to be completely stable -- the MX28F1000P that Biostar included would never write out the DMI table and would make anything that tried to access it (Speedsys, WMI, DXDiag) hang the machine. An AT29C010A is much better behaved. Current working theory on VOGONS is Biostar goofed up and bundled a chip that needs 12V to program -- the AT29C010A doesn't and has that pin internally disconnected.