I came across this just now on the Macintosh Garden: http://macintoshgard...date-version-13
Sonnet Tango/Tempo Firmware Update (Version 1.3)
I (handle = weasel) have SUCCESSFULLY tested this patch with my Twentieth Anniversary Macintosh (TAM), running Mac OS 9.2.2, and an older Sonnet Tango/Temp combo card (Tango 2.0 — which I recently purchased used on eBay. A picture of the type of card I have is also uploaded. I suspect that this firmware update will work on a whole generation of older Sonnet Tango-series USB/FW combination cards!
Without this firmware update, the Mac only recognizes this card as some sort of "PCI Bridge", but neither USB nor Firewire devices work with it.
WITH this firmware update, so far the USB functionality works fine. Will test Firewire and update later.