Versions of the Apple CD-ROM system extension prior to 3.0 are incompatible
with System 7. Version 3.0 is mostly compatible with System 7, but version
3.1 is recommended. Users should install the Apple CD-ROM software BEFORE
installing System 7.
The upgrade to version 3.1 is free, and the files can be found in the
Upgrade folder on the System 7 Information bulletin board (use BB Pathfinder
to locate this bulletin board), as well as on the System 7 Group Upgrade Kit
CD.
The AppleCD SC hardware is compatible with all Macintosh systems that have
a SCSI interface.