gregl@tekgen.UUCP (05/24/86)
If you want to read about the SCSI (Small Computer Systems Interface), you can find a great article by Steve Ciarcia in the latest (May '86) BYTE magazine. It's a two-parter (part two next month), and although he specifically talks about the NCR 5380 SCSI chip and hooking it onto his SB180 board, he clues you in on: o the background of SCSI (SASI and the ANSI subcommittee) o its various system architecture implementation schemes o the physical hardware interface o the logical interface Next month, he plans on detailing the communications of the protocol and the different bus phases. I recommend this series for those who have little knowledge of SCSI (like me! :-) . It's very well written (like all his articles -- can you tell I'm a fan?). I've also read up here on the net people saying that SCSI is just SASI with a name change. According to Ciarcia, this is true of SCSI _in_its_ _simplest_form_. To quote: "SCSI in its simplest form is just a SASI interface. SASI designs assume that one host will select a peripheral device, most likely a disk drive, and remain connected to it until the I/O transfer is completed. Because these products are used in low-cost, low-performance applications, single-ended configurations that do not support parity are the most popular." -- Steve Ciarcia "Adding SCSI to the SB180 Computer Part 1: Introduction" BYTE Magazine, May 1986 Apparently there are more sophisticated SCSI implementations out there which are NOT the same as SASI (e.g. multi-processor and/or multi-tasking architectures). Anybody care to comment? ----------------------------------------------------------------------- Greg (can you say LAYOFF? There, I knew you could. :-) Lacefield ...!tektronix!tekgen!gregl ^^^^^^^^^ (for now!) Disclaimer: The above endorsements are my own, not of my employer, whomever THAT might be :-) <---- pasted smile