FANDOM


To find out which ROM version your Apple IIc has, just type from Applesoft BASIC the following

?PEEK(-1089)

Or in the Monitor

FBBF

The following information comes from the Apple IIc Technical Note #7[1]

Original IIc ( $FBBF = $FF or 255 in decimal)

  • 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
  • Adds the Mini-Assembler to the Monitor
  • Adds the Built-in Diagnostics

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

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


  1. http://www.umich.edu/~archive/apple2/technotes/tn/aiic/TN.AIIC.007