Re: Did Commodore cheat with the quad density floppies?

From: Mike Stein <*mhs.stein_at_gmail.com*> Date: Tue, 8 Jan 2019 17:22:19 -0500 Message-ID: <3A15AE41F3F74C4D9BD869D9AD79E905@310e2> · mhs.stein_at_gmail.com

----- Original Message ----- 
From: "Mia Magnusson" <mia@plea.se>
To: <cbm-hackers@musoftware.de>
Sent: Tuesday, January 08, 2019 4:40 PM
Subject: Re: Did Commodore cheat with the quad density floppies?

> Den Tue, 8 Jan 2019 13:04:41 -0500 skrev "Mike Stein"
> <mhs.stein@gmail.com>:
>> As to mixing drive types, most normal PC controllers were either low
>> density (DD/QD) or high density, but rarely both;
> 
> I've never ever stumbled upon a PC controller that only supports HD
> format. Were that ever a thing?

Sorry; of course within the limitations of the head dimensions HD controllers generally could indeed support DD media. What I was thinking of was the drive speed; instead of switching speed on dual-speed drives most controllers just emulated the slower speed by changing the transfer rate.