myoldmac.net - Apple IIc F.A.Q.
Apple IIc: Existing Versions

Apple IIc - Existing Versions

Apple II
Technical Notes
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Developer Technical Support
Apple IIc #7: Existing Versions

Revised by: Matt Deatherage November 1988
Written by: Guillermo Ortiz November 1987

This Technical Note describes the main differences between the five different
IIc ROM versions which encompass the original IIc and four revisions.
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Original Apple IIc ($FBBF = $FF)

o Can use the IIc external drive only
o No AppleTalk firmware
o PR#7 boots the second drive
o Mouse firmware maps to slot 4
o Serial firmware does not mask incoming linefeed characters
o Serial firmware does not support XON/XOFF protocol

3.5 ROM Apple IIc ($FBBF = $00)

o Can use the IIc external drive and the UniDisk 3.5 drive
o AppleTalk firmware maps to slot 7
o PR#7 returns the message "AppleTalk Off Line"
o Mouse firmware maps to slot 4
o Serial firmware defaults to mask all incoming linefeed characters
o Serial firmware supports XON/XOFF protocol

"Memory-Expandable" IIc ( $FBBF = $03)

o Can use the IIc external drive, the UniDisk 3.5 drive, and the IIc
Memory Expansion Card
o Mouse firmware maps to slot 7
o No AppleTalk firmware
o PR#7 kills the system
o Serial firmware defaults to mask all incoming linefeed characters
o Serial firmware supports XON/XOFF protocol

Revised "Memory-Expandable" IIc ($FBBF = $04)

Same as Original Memory-Expandable, plus:
o Keyboard buffering firmware bug fixed
o Firmware returns correct information when the Memory Expansion Card is
not present

Apple IIc Plus ($FBBF = $05)

o Can use the external IIc drive, the UniDisk 3.5 drive, the Apple 3.5
drives, but not the original IIc Memory Expansion