Hey There!
Yeah, I'm not quite sure either why I'm having so much trouble with that thing *laughs* ... Of course it could always be that the USB card was faulty when I purchased way back when since it had been previously used. I did actually own a Tempo Trio for a while and used it in my system with the associated Open Firmware patch, which allowed the card to be used (that only worked for the older models, newer cards received a chipset revision at some points which broke the OF patch). USB was detected (never tried it), but I could never get the IDE ports to recognize my drive.
Something that I noticed after selling the Tempo Trio was that the issue was most likely caused by the drive and not the card. For some reason MacOS absolutely REFUSED to detect the 20GB Toshiba drive I had attached, but when I hooked up a different one (80GB Toshiba drive), it saw it right a way. I'm kinda biting my rear over the fact that I sold the card before having tried it with a different drive }
... I made $90,-- off that card back then, who knows how much it would be now if I were to buy it 
On a sidenote, when you stick in a generic USB 2.0 card (as you said, OHCI compliant), MacOS will detect it as an USB adapter (ASP will actually display it as two separate cards - PCI bridging) but the ports are not functioning, plugging in e.g. a flash drive, won't do anything, nothing loads.
I may just buy one of these cards with the bigger oscillator and different layout to give it a try especially when considering that you can get them for next to nothing these days.
Yeah, I'm not quite sure either why I'm having so much trouble with that thing *laughs* ... Of course it could always be that the USB card was faulty when I purchased way back when since it had been previously used. I did actually own a Tempo Trio for a while and used it in my system with the associated Open Firmware patch, which allowed the card to be used (that only worked for the older models, newer cards received a chipset revision at some points which broke the OF patch). USB was detected (never tried it), but I could never get the IDE ports to recognize my drive.
Something that I noticed after selling the Tempo Trio was that the issue was most likely caused by the drive and not the card. For some reason MacOS absolutely REFUSED to detect the 20GB Toshiba drive I had attached, but when I hooked up a different one (80GB Toshiba drive), it saw it right a way. I'm kinda biting my rear over the fact that I sold the card before having tried it with a different drive }
... I made $90,-- off that card back then, who knows how much it would be now if I were to buy it On a sidenote, when you stick in a generic USB 2.0 card (as you said, OHCI compliant), MacOS will detect it as an USB adapter (ASP will actually display it as two separate cards - PCI bridging) but the ports are not functioning, plugging in e.g. a flash drive, won't do anything, nothing loads.
I may just buy one of these cards with the bigger oscillator and different layout to give it a try especially when considering that you can get them for next to nothing these days.