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Re: Create Amiga diskettes on Mac

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Den fredagen den 7:e maj 2010 kl. 12:16:11 UTC+2 skrev M.O.B. i L.:
> Thomas Richter wrote:
> > M.O.B. i L. wrote:
> >> Is it possible to create bootable Amiga-diskettes on a Mac68K? What 
> >> software on the Mac should one use?
> > 
> > Likely not. The Mac DD drives use many tricks, like making the rotation 
> > speed depending on the track, and this is very much incompatible with 
> > the Amiga layout. Even more, Amiga uses a custom track format that is 
> > not compatible to that of common controllers.
> 
> I've read in a Swedish usenet groups (se.dator.sys.amiga, 
> swnet.sys.amiga) that an old Mac could write the first track in 
> Amiga-format. He didn't remember what program he used on the Mac though 
> but had used it himself to transfer small files.

You can't use a Apple 800k drive to make Amiga disks. Amiga uses a completely different type of approach. The Apple 800k drive also uses variable speeds to make it even worse.

Likewise, a PC uses hard index (rotation signal pulse) for sectoring.

The Amiga uses a syncword ($4489) which is equal to MC680x0 ILLEGAL instruction. That's why Amiga drives unlike a PC, in SD (Single density) fits 880k vs a PC's 720k (raw data, excluding filesystem) and a HD (High density) fits 1.76MB vs a PC's 1.44MB.

There IS hardware differences between Amiga and PC floppy drives, but there exists hardware, as previously mentioned, that can be used to read and write disks to and from native Amiga, like CatWeasel

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Re: Create Amiga diskettes on Mac Mikael Fors <swextal@gmail.com> - 2014-07-11 04:53 -0700
  Re: Create Amiga diskettes on Mac Thomas Richter <thor@math.tu-berlin.de> - 2014-07-14 14:43 +0200

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