> How does one access the SCSI bus in UNIX?  How/when does the ANSI CAM come
> into play?

The first question doesn't really make sense.  You access the SCSI bus
via drivers.  Specifically how depends on the hardware and the system.
Usually, there are at least two drivers between user code and the SCSI
device--the SCSI device driver and the SCSI bus device driver.  The
first would be for, say, the disk or tape or scanner or whatever.  The
second is used by the first to actually get to the device across the
bus.

I know very little about CAM, but I got the impression that CAM sits
between the user and the low-level driver--perhaps in conjunction with
or in place of the disk-/tape-/cd-specific drivers.

-allen

-- 
Allen Briggs - end killing - allen.briggs@bev.net ** MacBSD == NetBSD/mac68k **