Before even MS-DOS, there was CP/M: the Control Program for
Microcomputers. This ancient operating system was still sufficiently
viable in the mid-80s that two different companies sold Mac CP/M
environments (the other being CP/M-68K by IQ Software).

To turn your 128K or 512K Mac into a CP/M machine: boot from the Boot
Disk, open the CP/M app, then insert the CP/M OS Disk and press any
key.

Note: CP/M uses its own disk format, which is not readable in the Mac
OS. 400K Mac disks can be formatted for CP/M from within CP/M.

Important: This app is not compatible with the Macintosh Plus (or
anything newer). To emulate it, you will need the Mac 128K or 512K
[variation][1] of Mini vMac (and a matching ROM.)

Version: Island CP/M Boot Disk v1.0; CP/M operating system v2.2

Compatibility
Architecture: 68k

  [1]: http://minivmac.sourceforge.net/doc/var/index.html

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