Re: Did Commodore cheat with the quad density floppies?

From: groepaz_at_gmx.net
Date: Thu, 03 Jan 2019 17:41:29 +0100
Message-ID: <12089245.89CktKvZym@rakete>
Am Donnerstag, 3. Januar 2019, 15:38:49 CET schrieb Gerrit Heitsch:
> On 1/3/19 3:15 PM, Francesco Messineo wrote:
> > I remember nobody ever tried to find "QD" disks, normal DD 48TPI disks
> > were used (albeit I remember good quality brands were purchased
> > usually, like 3M, Olivetti).
> 
> When I bought a whole lot of C64, 1541, an Amiga 2000A and some other
> stuff in 2011 for 20 Euros total on ebay (those were the days...), the
> lot also included about 500 floppy disks. When making D64 images from
> them, I came about a few QD disks, so they did exist.
> 
> > There're two different issues on compact cassette:
> > 1) different (really much different) magnetic media, type I (Fe2O3,
> > iron oxide), Type II (CrO2), type III (FeCr), type IV (metal), these
> > media required different equalization and different recording
> > currents. Type I are usually very bad sounding and noisy, type IV have
> > the best quality, but the recorder really NEEDS to know what type of
> > tape it's trying to record into, otherwise you wouldn't get much
> > better results, unless maybe a bit less noise if you use a type IV
> > tape on a old, low quality recorder.
> 
> Back when Type II was established, the type II tapes had an extra notch
> next to the erase control tab and most recorders had a sensor that
> detected the type that way. Wasn't something like this also added for
> type IV as well?

something like this WAS added for 3.5" HD floppies :)

(and yes, QD disks are just the same as SD/DD)

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I see in C64.h a list of defines. 
<Wildstar> 
Received on 2019-01-03 18:00:30

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