1 Feb
2022
1 Feb
'22
4:34 p.m.
On Feb 1, 2022, at 6:46 PM, Jon Elson via cctalk
<cctalk at classiccmp.org> wrote:
On 2/1/22 15:40, Paul Koning via cctalk wrote:
All SCSI devices were logical block number, all the way back to the original SASI
(Shugart Associates System Interface). I had a 10 MB Memorex Winchester drive with SASI
adapter on my Z-80 CP/M system in about 1981 or so. Maybe I misunderstood your sentence
above, what the "later" applied to.
I meant that SCSI appeared later than MSCP. And that it used LBA addressing, but MSCP did
it before SCSI.
paul
On Feb 1, 2022, at 4:31 PM, Grant Taylor via
cctalk <cctalk at classiccmp.org> wrote:
On 2/1/22 11:23 AM, Paul Koning via cctalk wrote:
Mass Storage
Control Protocol, the geometry-independent storage access scheme DEC created in the early
1980s. Early implementations include the HSC50 (for VAXclusters) and the UDA50 (Unibus
adapter), talking to disk drives such as the RA80.
With MSCP, DEC switched to addressing disks by sector offset, as SCSI did later, rather
than by geometry (cylinder, track, sector) Did any DEC MSCP disks use it?
Please
expand "MSCP". My brain is failing to do so at the moment.