Apple IIc ROM Versions

Find out your ROM version by clicking Control-Reset typing right after boot and type print peek(64447)

Original IIc ( $FBBF = $FF )

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

3.5 ROM IIc ( $FBBF = $00 )

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

Original “Memory-Expandable” IIc ( $FBBF = $03 )

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

Revised “Memory-Expandable” IIc ( $FBBF = $04 )

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

Apple IIc Plus ( $FBBF = $05 )

 Can use the external IIc drive, the UniDisk 3.5 drive, the Apple 3.5
drives, but not the original IIc Memory Expansion Card.
 Contains a Memory Expansion Card connector
 3.5″ internal drive replaces 5.25″ internal drive
 Mouse maps to slot 7
 PR#7 kills the system
 4 MHz 65C02 microprocessor
 Accelerator chip and static RAM cache permit operation up to 4 MHz
 Keyboard replaced with Apple Standard Keyboard (minus numeric keypad)
 Internal power supply
 Internal modem connector
 Serial ports refitted with mini-DIN 8 connectors
 Headphone jack has been removed
 Volume control relocated above the keyboard
 40/80 column switch replaced by keyboard (Sholes/Dvorak) switch

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