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IIC.07.VERSIONS.txt
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Apple II
Technical Notes
_____________________________________________________________________________
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.
_____________________________________________________________________________
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
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