gslick
Veteran Member
USB support on PIIX3 boards in 1996 was extremely hit or miss. They were most likely to work on an ATX or OEM proprietary board that had built in ports. Baby AT 430VX/HX boards generally lacked a header. If they had one, many times there was no setting to turn USB on in the BIOS!
The first boxes with PIIX3 USB that we got from Intel (if I remember right they were called PDK boxes, Platform Development Kit) were ATX form factor and had USB ports on the motherboard, but the BIOS did not enable the USB function. There was a batch file we ran that poked a bit in the PIIX3 PCI Function 0 Miscellaneous Status Register to enable the PCI Function 2 USB controller.