HP Integral PC Manuals

[Rik]

But maybe it's just out of consideration for the not over rated PSU.
So it has not to deal with current peaks from  starting and stopping the 
floppy drive ;-)
I think there was a reason may EMI or something like that..
Or it's just a engineering artifact they forgot to fix.

Rik

----- Original Message ----- 
From: "Tony Duell" <ard at p850ug1.demon.co.uk>
To: <cctalk at classiccmp.org>
Sent: Tuesday, May 06, 2008 11:47 PM
Subject: Re: HP Integral PC Manuals


>>
>> Yes V1.0.0 I think the same it's just designed to keep the motors 
>> running.
>> Maybe to get the media running before the heads touch it, to prevent
>> start/stop spots ?
>
> Of course this is one of the few 3.5" drives that has a head-load
> solenoid (and yes, that is controlled 'correctly'). So at least disk/head
> wear will be fairly minimal. It is curious that having provided a
> motor-control signal then essentially it's not used (min you, it appears
> that the Intgral hardware would support 2 floppy drives, and that
> facility, AFAIK, was never used)
>
> I am not sure what the Sony drive spec says about starting/stopping the
> spindle motor with the heads loaded. I've not heard it's a problem in
> other (floppy) drives, though.
>
>> Well the ability to make errors is what makes us human ;-)
>> The hartbeat should it be some kind of watchdog signal or a sync for
>> realtime processing ?
>
> It usspect it's the task-switch signal, etc. When the machine is 'idle'
> (no I/O going on), IR1 is the only interrupt line to be doing anything.
>
> -tony
>
>