Did honorable screwdriver combat against this TECO TR3230F/Relisys RWT205CE, which is a “legacy-free” thin client based on the 200MHz SiS550 SoC (which itself is derived from the Rise mP6) - tried to get a Yamaha YMF724 or a Crystal 4630 to work with it.
Ultimately fruitless.
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What’s good about it?
a) The SiS550 is kinda rare and performs somewhat well against a 200MHz Pentium MMX.
b) Uses PC100/133 SDRAM
c) Low power usage (about 4w on tap, which compares well to the 6w used by my Wyse 5070 thin client)
d) Fairly competent 2D core (SiS301, or the 2D base of the SiS315 Mirage series) - the SiS UniVGA drivers for Win98 can be modified to work with it.
And bad?
a) AC97 only with an ADI AD1881 codec
b) No support for DMA or bus mastering in LPC or ISA
(no old school Soundblaster support for you)
c) Seemingly no support for the same in PCI (so the YMF 7 series and Solo-1 cards won’t work)
d) No publicly available datasheet with register file info for it, so it’s not like you can bitbang it to work like with a Trident 4Dwave legacy core.
Who would find something that performs like a Pentium 233MMX with no legacy support to be useful? At least the Via C3s with the 686C/8231 southbridge or a K6 embedded with a SiS Chipset would happily work with the YMFs or the Solo-1s, and the slower NatSemi Geodes will have SB emulation baked into its BIOS via some SMI (system management interface) state machine. What is this good for, really?
Eh, if you find one, strip it if its useful components and put it back into the recycling bin. It's not really worth your while.