29 Nov
2000
29 Nov
'00
11:42 a.m.
At 11:32 PM 11/28/00 -0800, you wrote:
Tony Duell wrote:
The drives are HP model 97500-85620.
The following places on the net show it as a SCSI drive:
http://www.pc-disk.de/pcdisk/h/2000/1208.htm
http://nuked.org/download/theref/theref.aquascape.com/hard_drives/h_hp-9750
0-85620.html
On a related note, the hard disks in the 9154 are supposed to be 20MB
3.5" SCSI drives, but they use a smaller connector that I am not
familiar with, and again no power connector. Is there some standard for
SCSI that came before the normal SCSI-1 type connector or did HP do some
proprietary type of connector?
Are you sure it's SCSI? I thought it was some custom interface. It
certainly didn't look like SCSI to me...
http://www.rdg.ac.uk/CSC/Topic/Techs/TeXDhdre01/hdref2.html
http://www.mfarris.com/hard/Hewlett_Packard1.html
Of course, they could all be getting their information from the same
incorrect source. In a way though, SCSI does make sense since the drives
do have integrated drive electronics. From the period, the only drives
that I know of with integrated controllers were either SCSI or SASI. I
thought that SASI was only used by Shuggart. The PC versions did not
appear until about 1988 (later than the 9153/9154), and I doubt that HP
(at that time) would have use the PC types anyway.
At some point, I will pull the integrated controller board off the disk
and look to see if any standard parts were used. Also, the chips that I
can see on the main board in the drive seem to use HP ASICs (an 84 and a
68 pin CQFP).
-Pete