Commodore 128 System Manual page 199

software has been made available through the Independent
Commodore Products Users Group (ICPUG), for which
membership application forms can be obtained by sending an
s.a.e. to Membership Secretary, ICPUG, 30 Brancaster Road,
Newbury Park, Ilford, Essex, IG2 7EP, England.
CP/M normally uses Modified Frequency Modulation (MFM) to
record on disks. Commodore DOS normally uses Group Code
Recording (GCR). The Commodore 1571 disk drive can read
both, but the older 1541 can only read GCR. Off-the-shelf CP/M
software packages only come as MFM disks. Even within MFM
there are many different formats: the 1571 can read disks
formatted for:
Epson QX10
IBM-8 SS (CP/M -86)
IBM-8 DS (CP/M -86)
IBM-9 SS (CP/M -86)
IBM-9 DS (CP/M -86)
KayPro II
KayPro IV
Osborne DD SS
Osborne DD DS
Therefore when buying CP/M software you must buy it on a disk
in one of the above formats. Also, be aware that your C128 will
run software written to run under either CP/M 2.2 or CP/M Plus
(which is the newer name for what was originally known as
version 3). However, CP/M -86 is the version of CP/M designed
for use on 16-bit processors: CP/M -86 software will not run on
your C128's 8-bit Z80 processor, although the 1571 drive will let
you read CP/M -86 data files.
(512 byte sectors, double sided, 10
sectors per track)
(512 byte sectors, single sided, 8
sectors per track)
(512 byte sectors, double sided, 8
sectors per track)
(512 byte sectors, single sided, 9
sectors per track)
(512 byte sectors, double sided, 9
sectors per track)
(512 byte sectors, single sided, 10
sectors per track)
(512 byte sectors, double sided, 10
sectors per track)
(1024 byte sectors, single sided, 5
sectors per track)
(1024 byte sectors, double sided, 5
sectors per track)
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