Re: Did Commodore cheat with the quad density floppies?

Am Sonntag, 6. Januar 2019, 03:07:29 CET schrieb Mike Stein:
> ----- Original Message -----
> From: <groepaz@gmx.net>
> To: <cbm-hackers@musoftware.de>
> Sent: Saturday, January 05, 2019 7:15 PM
> Subject: Re: Did Commodore cheat with the quad density floppies?
> 
> > Am Sonntag, 6. Januar 2019, 00:19:15 CET schrieb smf:
> >> On 05/01/2019 21:16, Mike Stein wrote:
> >> > It goes without saying that in the PC world we are restricted to using
> >> > unmodified standard off-the-shelf  disk drives available at the time,
> >> 
> >> I can't find it these days & it may have been chucked out, but I once
> >> rescued a 3.5" floppy drive from an olivetti PC that had jumpers for
> >> EVERYTHING. It was insane.
> > 
> > i have a nice 360K 5.25" one from olivetti.... it looks like a third of
> > the
> > board space is used for jumpers. or something =D
> 
> There were indeed 5.25" drives with various options (actually 8" drives were
> the worst) but the common FH drives of the day that IBM used (Tandon, Qume,
> MPI etc.) generally only had little more than the 4 drive select jumpers,
> and NO drive ever had a jumper that relocated the Motor On signal AFAIK;
> most of the latest 3.5" HD drives had no jumpers at all since they would
> almost certainly be used in a PC.

i remember weird things with motor-signal and disk-ready.... but forgot the 
details, too long ago. and i still have to figure out how to jumper the 8" 
drive i got =P

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