Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!husc6!m2c!wpi!dseah
From: dseah@wpi.wpi.edu (David I Seah)
Newsgroups: comp.sys.apple
Subject: 1979 Graphics Tablet software
Keywords: DOS 3.2, keyboard buffer, RAM card interference
Message-ID: <2268@wpi.wpi.edu>
Date: 10 May 89 04:49:12 GMT
Organization: Worcester Polytechnic Institute, Worcester, Mass.
Lines: 34

I picked up the original 1979 disk for the Apple Graphics Tablet for $5.00 at
AppleFest.  I have an old Graphics Tablet, so I was curious to see what this
old software would be like.

So, I popped the disk in the drive and booted from slot 6.  Not a Startup
Disk!  Couldn't catalog it with ProDOS or DOS 3.3, I had to break out Copy II
Plus 5.0 to read this DOS 3.2 disk.  Using Copy II Plus, I copied the files
over to a DiversiDOS 3.3 disk.

Next Problem: I have the Graphics Tablet card in Slot 6.  I had to boot from
slot 6, so I moved it to slot 7, next to my old gsRAM card.  Hooray!  The card
was recognized and I tried to calibrate the tablet with the software...funny,
it's not working.  I booted up DeluxePaint II with the Tablet CDA.  The pen is
registering funny.  Apparently, the gsRAM card is interfering massively with
the tablet or pen electronics. I moved  the card back to slot 6 (other slots are
sort of filled or needed for mouse/smartport/etc).  I copied the files to a
UniDOS 3.3 disk and booted from that.

Everything worked dandy at first.  The tablet was calibrated (although the
software was a little rude :) and I pressed "G" to run the graphics software. 
However, "ERROR PEEK(222)=53".  I pressed reset and typed RESUME to see the
real error.  It was an out of range error in assigning the value
peek(753)*256+peek(752) to an integer variable EP%.  753 translated to an
address in the high end of the keyboard buffer ($200-$2FF).  Scouting through
the rest of the program, I notice that there are many references to locations
in this range.

Nothing was loaded/poked into here.  I vaguely remember that DOS 3.2 partially
bootstrapped into this section of memory...but I thought it was closer to
$300.  Can anybody help me with this problem?  Is there something special
about the Graphics Tablet Software (680-0007-00) DOS?  This disk is so old, it
doesn't have a reinforced hub.  

Dave Seah (dseah@wpi.wpi.edu, dseah@wpi.bitnet);