Mac OS 8.1 and later support USB 1.0 / 1.1 but no company or independent
software developers could be bothered to consider writing USB 2.0 drivers for
those OS versions - not even the guy who wrote USB Overdrive to support many
peripherals that neither Apple nor the device manufacturers would deign to
support on Macintosh.
Why the massive disinterest? There was a period of time between the
introduction of USB 2.0 and when OS X began to not suck that someone could've
made some decent income selling a USB 2.0 controller driver for Mac OS 8.1 and
9.x.x.
Since the Classic OS and the Macs it runs on have slipped into the hobbyist and
collector, how about a second look? Hackers keep figuring out way to hook up
all kinds of new technologies to old computers far more primitive than an old
Macintosh - but the old Macintoshes are all but ignored by such hobbyists.
The easiest place to start would be a driver for the NEC USB 2.0 chips on PCI
boards, installed in PCI PowerMacs running OS 9.x.x. For the VIA chips, all
most anyone could ever get working with them on Mac was a keyboard and mouse.
If it's a hardware issue the problems are likely unfixable. If Apple's USB 1
driver is just that bad with VIA, then there may be hope, but it'd involve also
fixing USB 1 support.
Easier to write a USB 2 driver for NEC than to do that *and* fix USB 1 for VIA.
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