reading apple ii disks with PCs: it WORKS !!!

From: Curt vendel <curt_at_atarimuseum.com>
Date: Mon Jan 5 18:00:25 2004

So where do we d/l this magical software?!?!?


Curt


----- Original Message -----
From: "Fred Cisin" <cisin_at_xenosoft.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk_at_classiccmp.org>
Sent: Monday, January 05, 2004 6:54 PM
Subject: Re: reading apple ii disks with PCs: it WORKS !!!


> On Mon, 5 Jan 2004, Pete Turnbull wrote:
> > On Jan 5, 15:02, Gene Buckle wrote:
> > > Me, I want to know how they make an FM/MFM drive read a GCR disk...
> > It's not a drive issue, it's a controller issue. The bits on the disk
> > are just bits on a disk... just alternating magnetic poles. There's
> > nothing strange or different about the heads or amplifiers on an Apple,
> > Commodore, or Amiga drive.
>
> ... but the controller is ALSO FM/MFM. THAT is the "impossible" part.
>
> hint: disrupt in mid-read by messing with drive select
>
> and some drives work easier than others for it. For example,
> with the Apple Turnover, Tandon TM100 drives worked well,
> but Teac 55's would often not work without some minor mods.
>
>
> Long ago, I tried unsuccessfully to implement the technique.
> And then more recently, I tried some software that purported
> to do it. Also unsuccessfully.
>
> But neither of my attempts were in sufficient depth to state
> that the technique can't work - my congratulations to the guy
> who succeeded!
>
>
> And once there is a successful track read, parsing sectors
> and working out the DIRectory is straight-forward.
>
> --
> Grumpy Ol' Fred cisin_at_xenosoft.com
>
Received on Mon Jan 05 2004 - 18:00:25 GMT

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