Apple 2c hardware revision identification

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Joined: Sep 27 2017
Posts: 6

While I wait for items to fix my 2c monitor and get it and the 2c up and running I opened it up and have done some reading. I came across some information on modding it while i was looking to see if i could upgrade the memory I found some versions can be upgraded and have a socket to do that. My question is without being able to see the output how do i identify what hardware revision I have? I believe I have the 32bit version because w2 connected and w1 is not, past that I don't know. Is there somewhere I can find the information?

Thanks
Mike

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cbmeeks's picture
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Joined: Jan 17 2005
Posts: 56
Re: Apple 2c hardware revision identification

I'm curious...what are you wanting to use that needs more than 128K?

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Joined: Sep 27 2017
Posts: 6
Re: Apple 2c hardware revision identification

Nothing in particular except maybe cad if it will run it. That and I'm trying to figure out if there is a way to get my external scsi drive to work on it.

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Joined: Oct 9 2013
Posts: 366
Re: Apple 2c hardware revision identification

IF you're trying to identify which ROM version of a IIc you have, type ?PEEK(-1089) in Applesoft or FBBF in the monitor.

Here's a link to Apple IIc Technical note #7

Here's the actual text:

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