Apple II
Technical Notes
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                                                  Developer Technical Support


Apple IIc
#8:    Single-Sided 3.5Ó Media and the Apple IIc Plus

Written by:    Llew Roberts                                          May 1989

This Technical Note describes a media limitation on the internal drive of
the Apple IIc Plus.
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With the exception of the internal drive on the Apple IIc Plus, single-sided
3.5" disks are supported on all Apple 3.5" drives, including external disk
drives connected to an Apple IIc Plus.  The IIc Plus internal disk drive
assumes that all disks have an 800K capacity, so it returns valid reads on
blocks which occur on the formatted side and I/O errors on blocks which occur
on the unformatted side.  A disk may appear to work when the disk-reading
algorithm has read blocks only from the formatted side.

For these reasons, we suggest that you do not ship programs on single-sided
media.


Further Reference
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  o  Apple IIc Technical Reference Manual, Second Edition


