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 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 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

Original "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 Card.
o    Contains a Memory Expansion Card connector
o    3.5" internal drive replaces 5.25" internal drive
o    Mouse maps to slot 7
o    PR#7 kills the system
o    4 MHz 65C02 microprocessor
o    Accelerator chip and static RAM cache permit operation up to 4 MHz
o    Keyboard replaced with Apple Standard Keyboard (minus numeric keypad)
o    Internal power supply
o    Internal modem connector
o    Serial ports refitted with mini-DIN 8 connectors
o    Headphone jack has been removed
o    Volume control relocated above the keyboard
o    40/80 column switch replaced by keyboard (Sholes/Dvorak) switch


Further Reference
o    Apple IIc Technical Reference Manual
o    Apple IIc Technical Note #5, Memory Expansion on the Apple IIc
o    Apple IIc Technical Note #6, Buffering Blues
o    Apple II Miscellaneous Technical Note #2, Apple II Family Identification 
     Routines 2.1
o    Apple II Miscellaneous Technical Note #7, Apple II Family Identification
o    Apple II Miscellaneous Technical Note #8, Pascal 1.1 Firmware Protocol 
     ID Bytes

