Re: usb disk controller to read c64 disks.

From: Marko Mäkelä <>
Date: Wed, 21 Sep 2011 09:20:06 +0300
Message-ID: <20110921062006.GB2707@x60s>
On Tue, Sep 20, 2011 at 11:11:38PM -0400, MikeS wrote:
>>" be able to read a "flip disk" in a double sided mech, you would
>>need to find one where you can hack the mechanics to allow seek to
>>"track -4".
>It would also have to be able to rotate backwards... ;-)

Not necessarily. If you copy the raw data in real time (and buffer more 
than one rotation worth of it), you should be able to decode the track 
image in software. GCR is decoded in software anyway, it is not a big 
fundamental difference.

>I must be missing something: why are you trying to read the "flip side" 
>with the upper head instead of just flipping the disk (assuming the 
>drive doesn't mind the missing index) ?

To save effort. Instead of having to insert and remove disks 2*N times, 
you would have to insert them only N times. It is left an exercise to 
the reader to estimate how big N has to be so that the effort invested 
in the modifications is justified.

An alternative explanation is along the lines of "Why climb a mountain?  
Because it exists."

Best regards,


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Received on 2011-09-21 07:00:03

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