cfj@isc.intel.com (Charlie Johnson) (10/19/90)
I had thought that the SCSI 2 specifications had increased the number of devices that you can have on a single SCSI string, but looking through my copy of the specs dated 03/09/90, it still says 8 devices. Addresses 0-7. Does anyone know what the real scoop is on this ?? Thanks!! -- Charles Johnson Intel Scientific Computers, MS CO1-01 15201 NW Greenbrier Pkwy Beaverton, OR 97006 phone: (503)629-7605 email: cfj@isc.intel.com
ben@epmooch.UUCP (Rev. Ben A. Mesander) (10/19/90)
>In article <967@intelisc.isc.intel.com> cfj@isc.intel.com (Charlie Johnson) writes: > > >I had thought that the SCSI 2 specifications had increased the number of >devices that you can have on a single SCSI string, but looking through >my copy of the specs dated 03/09/90, it still says 8 devices. Addresses >0-7. Does anyone know what the real scoop is on this ?? > >Thanks!! > > >-- >Charles Johnson >Intel Scientific Computers, MS CO1-01 >15201 NW Greenbrier Pkwy >Beaverton, OR 97006 phone: (503)629-7605 email: cfj@isc.intel.com The deal is the same for the number of devices on the bus. What they increased is the allowable number of logical units for each device. Most disk drives and such allow thier device number to be set (via jumpers), but are always LUN 0. Some of the ST-506 -> SCSI converters allow multiple ST-506 drives to appear as different LUN's on the same SCSI device. I'm sure there's other examples, but... It would have been hard to increase the allowable number of devices on the bus and maintain the same level of compatability with SCSI-1 as the committee did. -- | ben@epmooch.UUCP (Ben Mesander) | "Cash is more important than | | ben%servalan.UUCP@uokmax.ecn.uoknor.edu | your mother." - Al Shugart, | | !chinet!uokmax!servalan!epmooch!ben | CEO, Seagate Technologies |