30 Jan
2013
30 Jan
'13
3:31 p.m.
On Wed, Jan 30, 2013, Glen Slick wrote:
Not the exact manual you were looking for but might
have the same
information. This scanned copy includes pages Appendix A-1 through
A-36.
Thanks Glen that's great, must have been a few minor corrections to Appendix A
in this update to the original service manual.
I was interested to read about the differences between the 9121 and 82901 commands, eg the
9121 supports a superset of the 82901 commands and so should be fully backwards
compatible. One difference I have noted is using HPdir the 9121 appears to faster than the
82901, in that on a fast PC HPdir has to be slowed down to work successfully with the
82901 (eg by enabling logging) and works fine with the 9121, and on a slow PC both drives
work fine with no attempts to further slow down the program. I've fed this back to the
program author for further analysis.
I can try and dump the drive firmware if anyone is interested in doing a detailed
comparison.
Regards,
John
31 Jan
31 Jan
1:50 p.m.
I was interested to read about the differences between
the 9121 and
82901 commands, eg the 9121 supports a superset of the 82901 commands
and so should be fully backwards compatible. One difference I have noted
I beleive it was specifically designed to be. It was intended that any
systme that supported the 82901 could also use the 9121, no matter waht
assumptions it made. In this repsect, the respose to the standard
idenmtification coammends is the same, there is one extended command that
returns a differnet value o nthe 2 drives so it is possible to tell them
apart, but a ssytsem designed fo the 82901 wouldn't use that command.
Also the total numebr of sectors per disk is the same -- IIRC the 82901
is double-sided 35 cylidner and the 9121 is single sided 70 cylinder.
-tony
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