Re: Did Commodore cheat with the quad density floppies?

----- 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.