Re: Did Commodore cheat with the quad density floppies?

From: smf <*smf_at_null.net*> Date: Sat, 5 Jan 2019 23:00:24 +0000 Message-ID: <425bf6b0-9a48-0767-eb93-40ffd2e7f4bd@null.net> · smf_at_null.net

On 05/01/2019 06:50, Mike Stein wrote:
> A normal daisy chain cable directly connects all lines, including  the motor on/off line, of the two drives together in parallel; how could a jumper anywhere turn on one motor while leaving the other turned off?

There are two motor control lines and two drive select lines on the PC 
end, the twist swaps pins 10-16 so the floppy drive gets them on the 
same pins.

http://old.pinouts.ru/HD/InternalDisk_pinout.shtml

If you use jumpers on the floppy drive that tell it which of the two 
sets to use, then you don't need a twisted cable.

I prefer the twist, but lots of systems used jumpers on the drive instead.