3.21. I have a newer Adaptec controller and FreeBSD can't find it.

The newer AIC789x series Adaptec chips are supported under the CAM SCSI framework which made it's debut in 3.0. Patches against 2.2-STABLE are in ftp://ftp.freebsd.org/pub/FreeBSD/development/cam/. A CAM-enhanced boot floppy is available at http://www.freebsd.org/~abial/cam-boot/. In both cases read the README before beginning.