From: abulhak@nyx.cs.du.edu (Andrew Bulhak) Subject: Re: reading Atari 1040 foppys under Linux (raw with dd) ??? Date: Mon, 29 Mar 1993 03:13:21 GMT
bsa@kf8nh.wariat.org (Brandon S. Allbery) writes:
>In article <1993Mar19.145855.25228@Logix.DE> jwh@Logix.DE (Jan Hentsch) writes:
>>Is it possible to read Atari 1040 floppys into my linux box with dd.
>>I don't know anything about the physical and logical format of these
>>floppys, exect 360k and 720k capacity.
>>I played a bit with /etc/fdprm, added:
>>360/1440 1440 9 1 80 0 0x2A 0x02 0xDF 0x50
>>
>>but not success. I realized the setfdprm cmd, but there is no manpage...
>I though Atari TOS used what amounted to an MS-DOS format, but byteswapped
>(680x0-based). This would require a modified version of either mtools or the
>msdos fs code.
>Apple II and older Mac aren't possible. Apple used special multiple-speed
>drives, if I recall correctly; disks were written using different speeds on
>different tracks (five different speeds used on a single disk!). That's why a
>720K floppy on a PC is an 800K floppy on a Mac. (The Mac high-density format
>is single speed, I believe, it's just the filesystem layout that's different.)
Yes. There are MS-DOS programs for reading Mac disks (Mac-In-DOS is one such
program), and I have, on occasions, examined Mac disks with Norton Disk Editor.
(Note: This works only on 1.44Mb disks, as 880k disks are written using GCR
encoding and need different hardware to read.)
ObTrivia: GCR encoding is also used in the Apple II and Commodore 64 disk
formats.
>++Brandon
>--
>Brandon S. Allbery bsa@kf8nh.wariat.org
>It's not too late to turn back from the "Gates" of Hell...
>Linux. The FREE 32-bit operating system, available NOW.
// Andrew Bulhak abulhak@nyx.cs.du.edu
// "Life is like a can of peaches, only more oblong."