Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!csd4.milw.wisc.edu!bbn!husc6!rice!sun-spots-request From: bambam!hjp@uunet.uu.net (Howard J. Postley) Newsgroups: comp.sys.sun Subject: Re: SCSI Interface in the 3/80 Keywords: Hardware Message-ID: <4026@kalliope.rice.edu> Date: 22 Jun 89 16:50:15 GMT Sender: usenet@rice.edu Organization: Sun-Spots Lines: 32 Approved: Sun-Spots@rice.edu X-Sun-Spots-Digest: Volume 8, Issue 44, message 14 of 20 In article <3915@kalliope.rice.edu>, ely!haerle@rutgers.edu (Mark Haerle) writes: > The local sales rep indicated SCSI-1 and SCSI-2 devices may not be mixed > in a Sparc Station-1. The internal hard disks and the external storage > packs are not compatable with the old shoe boxes. You may run one standard > or the other, but not both on the same SCSI interface. The SCSI-2 has a > faster transfer and may also have a different command set. I wish that Sun had not decided to call things SCSI-1 and SCSI-2 because SCSI-2 is the newer SCSI definition that can deal with faster transfers and wider data paths. That's not what Sun uses them to mean. But I digress before actually getting started what what I wanted to say. The difference between Sun's SCSI-1 and SCSI-2 is that -2 supports syncronous transfers. The drives which support sync-SCSI contain a superset of the async-SCSI command set. There is no SCSI reason that the drives can't be mixed, I have done that many times. In fact, the 3.5" quantum drives, which are internal to the SS 1 are not sync-SCSI but the 327 is. If you hook a sync-capable drive to an async only interface, it just speaks slowly - but it still works fine. Anyway, I have setup SS 1's with both internal disks and an old shoebox so I know it works. I don't know what your sales rep was refering to. //hjp -- Howard Postley internet: hjp@bambam.bedrock.com Ideal Point, Inc. uucpnet: uunet!bambam!hjp phonenet: +1 215 578 6901 uspsnet: 13428 Maxella Av M/S 236; Marina del Rey, CA 90292