[comp.periphs.scsi] Implementation of SCSI-2

dwh@ataritx.uucp (Dave Hanna) (11/02/90)

Is there any reason that one of the chips used for SCSI-1 interfacing,
such as the 5380, cannot be used to implement a SCSI-2 capable interface,
neglecting the fast and wide options?  Are there any additional requirements
of the interface "glue" circuitry that are not true of SCSI-1?

I have skimmed through both the SCSI-1 and SCSI-2 specs, and no
problems jump out at me, but I wanted to take advantage to the skill
and knowledge of those on the net before I get into this.  Any information
would be appreciated.

Thanks.

   Dave Hanna



-- 
    Dave Hanna    Atari Microsystems Corp
	  UUCP   ...!texsun!letni!ataritx!dwh
		 ...!ames!atari!dhanna

ts@cup.portal.com (Tim W Smith) (11/04/90)

A 5380 will do fine.  The only chips that might have problems would
be chips that try to operate at a higher level and have some sort
of knowledge of the message protocol.  It is conceivable that such
a chip could not be able to send some of the new SCSI-2 messages,
such as the various queue tag messages.

I don't think any of the NCR chips suffer from this.  The ones we've
used here at work (5380, 5390, 5394, 53400, 53700, and 53710) all should
be OK.

					Tim Smith
					Ballard Synergy Corp.