3.5 drive on a IIc

[tomk@pro-sol.cts.com (Tom Kelly)]

Unknown User writes:

>com!user
>From: Walter.Johnson@utw.com (Walter Johnson)
>Newsgroups: comp.sys.apple2
>Subject: 3.5" Drive on a IIc
>Date: Thu, 03 Aug 1995 18:11:16 -0700
>Organization: Utah Wired
>Lines: 13
>Message-ID: <Walter.Johnson-0308951811160001@provo6.comnet.com>
>NNTP-Posting-Host: provo6.comnet.com
>
>What do I need to add a 3.5 disk drive to a IIc? Is an Apple Unidisk 3.5
>the right drive? Do I need any additional software?
>Thanks!
>Walter Johnson (Walter.Johnson@utw.com) www.utw.com/~wjohnson/Walter.html
>
In order to use a 3.5 drive on a IIc, you need two things.

1) UniDisk Drive (or a clone of it)
2) A IIc with a ROM that supports a UniDisk

 To find out which //c ROM version you have, go into BASIC (or if you
 don't have a disk handy, just turn on the computer and hit ctrl-reset
 after you see the "Check disk drive." message) and type the following
 line and hit return at the "]" prompt:
 
 PRINT PEEK (64447)
 
 If you get the number "255", then you have the original //c ROMs, and
 should go to your nearest authorized Apple Dealer and get your //c logic
 board swapped for free (bring your UniDisk 3.5" drive with you, along
 with any of its receipts, to verify that you actually HAVE one).  I
 believe Apple still honors this free swap, which corrects the problem of
 not being able to use the UniDisk 3.5" drive with the //c.  You should
 get the "3.5 ROM //c", which PEEK (64447) = 0.
 
 NOTE: ONLY PERSONS WHO HAVE PROOF OF OWNING A //c (with Original ROMs)
 AND A UNIDISK 3.5" DRIVE MAY GET THE LOGIC BOARD SWAP FOR FREE.  Please
 don't go to your Apple dealer and ask for the swap if you don't have a
 UniDisk 3.5".
 
 Values of the PEEK (64447) are as follows:
 
 255   Original //c ROM                   (Can't use UniDisk 3.5")
   0   3.5 ROM //c                        (CAN use UniDisk 3.5")
   3   Original "Memory-expandable" //c   (CAN use UniDisk 3.5")
   4   Revised "Memory-expandable" //c    (CAN use UniDisk 3.5")
 
   5   Apple //c+  (built-in 3.5" drive; can use Unidisk 3.5" AND Apple
3.5")
 
 For those of you who might be interested in other differences between
 //c ROM versions, see Apple // Tech Note #7 for the Apple //c.

When I took my IIc to the dealer about a month ago, I was told that the
upgrade is no longer FREE.

I ended up doing the upgrade myself.

For info on this send me E-Mail.

ProLine:  tomk@pro-sol
Internet: tomk@pro-sol.cts.com
UUCP:     crash!pro-sol!tomk