A cool vintage hardware hack.

From: Bob Shannon <bshannon_at_tiac.net>
Date: Thu Feb 13 11:01:00 2003

My understanding is that for RTE, different drivers are needed for 'H'
series drives on the 13037
controller. This is the migration path HP gave MAC disk users, and the
article I read in the users
group magazine complained bitterly about the complex issues of replacing
the system disk drivers
as well as the much lower performance. Their reccomendation was to NOT
upgrade existing MAC
drives to the 'ICD' (H-series) configuration for reasons of performance
and the complexity of the

That 7920 drive you got from my garage had been (incorrectly) modified
for the MAC to ICD upgrade, but
the heads had not been changed. The heads must be changed to make it a
real H seires drive becuse
the H series drives have a slower spindle speed, etc.

I think there are 3 different sets of drivers, native MAC (13037), H
series (13037 with H series drives) and
then the CS/80 drives, which use the 12821A HPIB interface board.

Hopefully I'm wrong, but I'll try to dig up the issue of the users group
magazine with the details.

Eric Smith wrote:

>Bob Shannon wrote:
>>If you need a different device driver (under RTE) to use a 7920H than
>>you do to use a 7920M, isn't it safe
>>to assume that there IS a low-level difference here (assuming both
>>drives are connected to a 13037 controller)?
>>How is this not related to your question?
>There are three configurations to consider:
> A) CPU --- 13037 --- 7920M
> B) CPU --- 13037 --- 7920H
> C) CPU --- native HPIB interface --- 7920H
> (I don't remember the P/N of the native interface)
>I knew that the configuration C needed a different driver than either
>A or B. I was NOT aware that A and B required different drivers; it
>was my impression that there was basically a "13037 driver". However,
>I'm definitely not an RTE expert.
Received on Thu Feb 13 2003 - 11:01:00 GMT

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