Re: 1571 images as G64

From: Pete Rittwage <>
Date: Thu, 30 May 2013 12:51:07 -0400 (EDT)
Message-ID: <>
On Thu, May 30, 2013 12:31 pm, wrote:
> Still interesting.. in CBM drives we can access half-tracks because the
> stepper is an 80 tracks one and the DOS moves it in double-steps. To move
> it in quarter-tracks would require different stepper I believe. Apart from
> this, if they need a special circuit to move it in quarter-tracks - does
> it make any sense when the non-modified drive can't access those anyway?

It's not a special circuit or a mod... it's more that there is no circuit
there at all to do it for you.  You don't just tell the drive to step up
or step down like the CBM, you manipulate the magnetic field coils a
certain way to move the drive head (push-pull electromagnets) purely in
software on the Apple.  Because of this, you have very free movement
withing track boundaries.

-Pete Rittwage

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Received on 2013-05-30 17:01:52

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