God help me, I'm starting another project.
I have obtained a "Blue Falcon" board from a friend, a 486 VLB/ISA board with (curious) onboard COM/LPT, IDE and floppy. The interesting part is that it uses an IBM "Blue Lightning" chip, a BL3-75. Based on the Cyrix 486SLC/DLC, this has better cache design I'm told, and can apparently hold its own even against a "real" DX4-100 despite the 25MHz IO. With the K6 to take up the slack for later DOS games that wouldn't run well either way such as Duke3D and Quake, I don't feel the need to push it as far as my last 486, but I
am curious to see how it'd perform actually clocked at 100MHz. Questions for later, perhaps.
So with that acquisition, I need a case, but that's also kind of funny, because the K6 motherboard has an ATX power plug and switch header despite being a baby AT board. So all I really need to do is, ahem,
fabricate another "AT" IO shield. The funny part is that, despite being no larger than a mATX board, it needs a full ATX case because of the slot placement.
The K6 is
also getting plenty of parts leftover from my defunct mATX PIII build, such as its drives and power supply, since it's leaving most of its current hardware behind for the 486 -- this includes the Yamaha sound card. I'm hoping my issues with it on the last 486 boiled down to the ISA bus being out of whack and the Yamaha card being sensitive to any deviation from spec -- certainly the other reason for not using it over the Vibra (the crappy drivers, rendered moot by the existence of UNISOUND) doesn't outweigh the fact that the Vibra is kind of a noisy POS, OPL3 or no.
The K6 is, therefore, being 'upgraded' to the YMF744 and a copy of Windows ME hacked to bits with 98lite. The Sensaura 3D sound was something I enjoyed immensely, as it was perfectly serviceable on speakers, something Aureal A3D can't really lay claim to. I forsee much less DOS usage in its future as the 486 will naturally be taking up 95% of that role, so I don't need real-mode access, since what it will be doing there ought to run Fine™ in a 9x DOS box, especially since the chipset
ought to properly support DDMA. Also, the out-of-the-box USB mass storage support would be nice instead of fighting with the nusb driver suite for 98. I'd run 2000 but the lack of lightweight shell options for it on a 128MB system is bad enough, the fact that the Voodoo3 was never really supported well on NT is what put the final nail in the coffin of that idea.
If I have the room, I'm going to swap in my PCI SCSI card too, if not, the K6 simply won't have SCSI anymore. I can confine my SCSI shenanigans to the 486 anyway, especially since I'm going to be installing 98lite there.
An interesting point is whether or not the 486 board has a socket for a math co-pro. Being essentially a hotrodded 386, the 486BL includes no co-processor on the chip itself and most software will ID it as a 486SX. I think the board has a Socket 2 for "regular" 486s but I don't remember seeing a 387 socket in the pictures. We'll see. If it does have a socket, I'll see about getting a FasMath or 387 of some kind -- at 25MHz it'll definitely be pokey, but nothing really uses it even if Windows checks for the presence of a co-pro to decide if it'll install or not. If not, I may have to rethink Windows entirely.
Maybe there's a x87 emulator driver for Windows 9x? I vaguely remember there being such a thing for 3.x...
I won't be upgrading the CPU since that's the only really interesting part of the whole thing. If I throw my Am5x86 at it, it just becomes another boring "fast" 486. Nothing special. As it is, the BL chip ought to provide some personality if nothing else.