> The NCR chips are the absolutely best chips for implementing SCSI.
> BUT, they are very difficult to program properly. SCRIPTS can be
> a cobra biting you on the butt at worst and a god send at best.
> With a properly written driver and SCRIPTS it's possible to attain
> 90% SCSI bus saturation.

"What Matt Jacob said, but with correct bus speed numbers."

Also:

At least compared to other SCSI engines such as the aic 7xxx family,
and the isp1020 (which include on-board microcode storage), the
lower-end 53c8xx models (which don't include script ram, or _any_
53c8xx models using a FreeBSD-derived driver (like the one in NetBSD)
because that driver doesn't support use of the script RAM) chew a
not-insignificant amount of PCI and memory bus bandwidth (lots of
script fetches).


I think the 53c8xx is a pretty good SCSI controller, but by no means
are they the best.


cgd