Date   : Wed, 16 Nov 1988 17:38:43 GMT
From   : ius3.ius.cs.cmu.edu!ralphw@pt.cs.cmu.edu (Ralph Hyre)
Subject: SCSI Implementations (adaptec manual)

I can reccomend the Adaptec ACB-4000(A) reference manual that you can
request with the board (which converts SCSI to ST-412/506 that those
cheap PClone drives want.  It describes EVERYTHING, and even has a
source listing for an 8085 (I think) driver in back.

On the disk side, there are easily-interfacable custom chips, like the NCR
5380, which has CMOS and high-performance variants.  There are lots of
things to worry about when building a SCSI interface, although if you only
plan to attach a single drive to a single computer then you can probably not 
worry about arbitration and other stuff.  These days, I'd go and build
a PClone backplane interface and buy the cheap cards for it.  (For example,
I think I saw a $49 SCSI interface in some random magazine the other day.)

As always, be careful about TERMPWR, this is where some SCSI devices 'miss'
obeying the SPEC.

Good luck.
-- 
                                       - Ralph W. Hyre, Jr.
Internet: ralphw@ius3.cs.cmu.edu    Phone:(412) CMU-BUGS
Amateur Packet Radio: N3FGW@W2XO, or c/o W3VC, CMU Radio Club, Pittsburgh, PA
"You can do what you want with my computer, but leave me alone!8-)"
--