ET> Where do I find documentation about SCSI commands and SCSI
 ET> programming?

At what level ?

If you are writing a device driver, you need to contact the manufacturer of
the SCSI host adapter that you are writing the driver for.  Some
manufacturers, like DPT, provide a device driver developers' toolkit,
including full documentation for the EATA protocol that the DPT host
adapters use, and example driver source code.

If you are writing a program that accesses SCSI devices in a
"raw" fashion, then you will need to know how to use ASPI, which
is mainly the way that an application-level programmer will "see"
SCSI, to access OS2ASPI.DMD.  The best documentation for this is probably
IBM's OS/2 Warp Device Driver Kit documentation, which presents the ASPI
interface *as other device drivers will see it*, but which, with a little
thought, is not hard to translate into how to access SCSI from
application-level code.

If you are interested in how SCSI works in the abstract, i.e. the protocol
itself without reference to programming specific host adapters, then books
such as _The SCSI Bus and IDE Interface_ (yes, I know that is a misnomer)
by Freidhelm Schmidt (Addison Wesley, 1998, 0-201-17514-2) will help quite
a lot.  (Although the translation from the original German is stilted and
absolutely appalling in places, that book is very good for understanding
the Common Command Set.)

 ¯ JdeBP ®

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