4 Feb
2013
4 Feb
'13
1:46 p.m.
From: Jeff Jonas
Sent: Friday, February 01, 2013 6:43 PM
Long ago when SCSI was young
and just an 8 bit parallel bus,
Ampro littleboards advocated using the SCSI bus
for peer to peer communications, not just master/slave.
Did anyone else do that?
At XKL, I once mentioned the use of CI-based disks on TOPS-20 (major
feature of v6.0) to one of the SCSI card engineers for the Toad-1.
He was intrigued by the idea, read the docs and the TOPS-20 source
code for the feature, and implemented MSCP on the FASTWIDE SCSI bus.
It never made it past the experimental stage (unfortunately, in my
opinion).
Computer Interconnect (CI) was a 50Mbit ethernet[1] designed for the
Jupiter (follow-on to the DEC-20, to be called the DECSYSTEM-4050),
and later retrofitted to the VAX, so I would think that our little
experiment qualifies as an edge case. :-)
[1] Lower case is intentional.
Rich Alderson
Vintage Computing Sr. Systems Engineer
Vulcan, Inc.
505 5th Avenue S, Suite 900
Seattle, WA 98104
mailto:RichA at vulcan.com
mailto:RichA at LivingComputerMuseum.org
http://www.LivingComputerMuseum.org/