DSD Diags disk found

Dan Gahlinger dgahling at hotmail.com
Sun Feb 8 21:00:32 CST 2009

I always wondered about this in a way.
I have a couple of 'alignment/test' disks for c64 drives,
originals and copies.

now as far as copies go, the drives were aligned perfectly, run through all tests, adjusted precisely,
then made copies with those.

so wouldn't that mean it was either 1) close enough or 2) the alignment of any other drive would only be to that drives setup,
which was as precise as we could get?

so in the end does it really matter all that much?


> Date: Sun, 8 Feb 2009 20:00:40 -0600
> From: jules.richardson99 at gmail.com
> To: 
> Subject: Re: DSD Diags disk found
> Fred Cisin wrote:
> > The Dysan Digital Diagnostic Diskette can not be duplicated with an
> > unmodified drive, no matter what software or special controller you might
> > use. (dd, rawcopy, option board, Match-Point, etc.)
> I believe there's a 5.25" version that has various portions that are pure 
> analog waveforms, too - you program your controller to read from those 
> particular tracks and then observe the waveforms coming off the read head, 
> using them to optimise alignment. The 8" version may not have been that 
> "sophisticated"...
> Either way, copying / archiving is not really an option. Anyone know what 
> machine was used to create such disks in the first place?
> cheers
> Jules

How fun is this? IMing with Windows Live Messenger just got better.

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