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, Second Edition 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