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Re: cbm 1541 drive reading AppleIIe 5.25" disks?
- Subject: Re: cbm 1541 drive reading AppleIIe 5.25" disks?
- From: <K3027E7@ALIJKU11.BITNET>
- Date: Mon, 7 Jun 1993 15:16:07 CDT
- Newsgroups: comp.sys.apple2, comp.sys.cbm
- Organization: Johannes Kepler University Linz - Computing Center
- References: <phillips.739176642@swanee> <ERIC.93Jun4165925@iceland.telebit.com>
- Xref: gmd.de comp.sys.apple2:29120 comp.sys.cbm:5994
eric@telebit.com (Eric Smith) writes:
>No such luck. GCR isn't a specific code, it is a whole family of codes.
>The Commodore disk hardware is much different than the Disk II, and I don't
>think there is any way that either can read the other's disks.
Yes, the Apple II uses a GCR encoding scheme different to CBM (2:1 and
4:3 instead of 5:4). On Apple II disks sequences of more than 8
1-bits can occur within data sections, which would be read as
synchronisation marks by the 1541.
Thus, some modification of the 1541 to switch off the automatic
synchronisation detection would be necessary, and of course some
difficult to write machine language routines in the 1541.
Richard Hable
k3027e7@edvz.uni-linz.ac.at