Re: Did Commodore cheat with the quad density floppies?

----- Original Message ----- 
From: <silverdr@wfmh.org.pl>
To: <cbm-hackers@musoftware.de>
Sent: Wednesday, January 09, 2019 5:20 AM
Subject: Re: Did Commodore cheat with the quad density floppies?



> On 2019-01-08, at 22:18, smf <smf@null.net> wrote:
> 
>> If you really wanted to and didn't mind running the motors concurrently, it was a simple enough mod to one of the drives to let you do what you insist is the "better way", i.e. selecting drives with the DS jumpers instead of position.
> 
> If the drives had DS jumpers then you just switch them both (i.e. if they were both jumpered DS1, then jumper both DS0).
> 
> The drives would then look at the other select line, which would have the effect of swapping the drive letter.

That would be a day and hands saver more than once, but even if the drives had jumpers, which became rare with time (as a result of the original design choice), I don't see how this would work. You could theoretically swap _DS2(1) with _DS3(2) but you'd also have to swap _MTR with _DS1(0) to have a working conf again.
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No need to swap; just add a jumper between DS0 and HM, pins 2 and 8 on the jumper block of the TM-100s of the day.