I was able to follow the instructions for compiling ft3xx.o at:
http://www.fys.ku.dk/~esban/promise376.html
which led to another successful install of Fedora Core 1!
Just to show you it worked: Issuing a cat /proc/scsi/ft3xx/0 yields:
PROMISE FastTrak TX4000/376/378/S150 TX Series Linux Driver Version 1.00.0.15
Adapter1 - FastTrak 376
Array - Array[1] : 1+0 Stripe (OK)
Drive -
1 : ST3160023AS IDE1/Master 160041MB IRQ(11) UDMA5 Array[1]
It's recognized and the only error I get is tainted kernel on boot!
Have at it!
RaXeT