7 May
2008
7 May
'08
1:52 p.m.
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