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 )
- 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
Further Reference
This and all of the other Apple II Technical Notes have been converted
to HTML by Aaron Heiss as a public service to the Apple II community, with
permission by Apple Computer, Inc. Any and all trademarks, registered and
otherwise, are properties of their owners.