Re: Commodore 15 Second disk format routine disassembled

From: gsteemso <48bitsorbust_at_gmail.com>
Date: Fri, 19 Jun 2026 06:09:05 -0700
Message-Id: <41A37A00-C63C-4168-ACCC-ACFEF4F5BC9B_at_gmail.com>
Hi,

> On Jun 19, 2026, at 5:59 AM, groepaz <groepaz_at_gmx.net> wrote:
> 
> Am Freitag, 19. Juni 2026, 14:45:10 Mitteleuropäische Sommerzeit schrieb
> gsteemso:
> 
>> ...maybe, if you could get the controller to squirt the bits out fast enough
>> (you can't), or if you could read them back fast enough (you really can't),
> 
> You really can. It works exactly the same no matter the track.
> 
>> or if it didn't exceed the media's design limits on flux transitions per
>> unit length (it does).
> 
> This is really the only problem - however its not THAT bad really.
> 
>> Working in simulation means nothing to actual physics.
> 
> After having developed stuff for the catweasel (which involved hundreds of
> different physical formats) i dare to say i know a little bit about the
> physics involved :)
> 
> (There have been commercial copy protections doing this, even on tracks > 35)

OK, I'll happily believe you if I can see it in action...  That said, I will have to remain skeptical until I see it survive (a) drives that vary slightly amongst themselves in spindle speed and (b) mediocre media quality.

G.
Received on 2026-06-19 15:00:01

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