Setup 23xxx Tablet with AutoCAD 12 for DOS

A.  Set Tablet Menu Settings to "AutoCAD as GTCO DP5"  from the DrawingBoard User's Guide:

    1.  It is necessary to have a menu strip on the tablet in order change the configuration settings.   
        Some of the early 2300
        Digitizers  were made with a fixed setting and do not have a menu strip. These models REQUIRE that you use
        those fixed settings in AutoCAD, (e.g. Summagraphics MM1201 setting).

    2.  If your model has a menu strip, here are the menu settings required to enable your digitizer to work with 
         AutoCAD 12 for DOS.

        MODE   PARITY  BAUD RATE    FORMAT     
        01000   1100       001       10000             

        DATA RATE  RESOLUTION     FREQ 
          111        110            1 

       (1 =  Power Light is  ON  0 = Power Light is  OFF) 
   
     3.  To change the menu settings:
  
         a.  Place the cursor on "Setup" box,
         b.  Pick the "0" button & the Power Light will come on.
         c.  Power Light  ON or OFF will indicate whether each switch is ON or OFF. The Pick 0 button will toggle the
              light to the setting you wish.
         d.  When finished, EXIT by hitting the "Setup" box again.

B.   Reconfigure AutoCAD for the CalComp Driver

     1.   Start AutoCAD and type "CONFIG" at the Command Line.

     2.   Choose "Configure Digitizer".

     3.   Do you want to select a different one? [Y]

     4.   Select "CalComp Digitizer Series ADI 4.2 - by CalComp" from the AutoCAD Digitizer Configuration menu.

     5.  You will be prompted for a model: choose Drawingboard; indicate the size of your board, number of buttons on
          your cursor,  the *COM in which the board is plugged. It will  ask if you wish to choose Polling or Interrupt. If you
          have a 486/66 or Pentium system, choose Polling. With the 386 it will depend on the system.  Try both polling
          and interrupt to define which works best with your system.

     6.   Type "0" to Exit

     7.   Keep configuration changes.  [Y]

     8.   Enter the drawing editor by opening or creating a drawing.


        a.  With the polling option, there could be possible crosshairs snagging or sticking  in Autocad.  This would  be a
            fraction of a second delay and happen about every 20 seconds.   Changing the Vscan  rate easily resolves this
            situation.  To make the changes you will need to be in the ACADR12\DOS  DIRECTORY and type:

            CFIG386  ACAD   -VSCAN   XXXXXX. 

            The formula to calculate the "XXXXXX" rate is as follows:

            Pentium 200:    20000   x Memory  x 11  
            Pentium 166:    20000   x Memory  x 10
            Pentium 150:   20000   x Memory  x 9
            Pentium 133:    20000   x Memory  x 8
            Pentium 120:    20000   x Memory  x 7
            Pentium 100:    20000   x Memory  x 6
            Pentium 90:     20000   x Memory  x 5
            Pentium 66:     20000   x Memory  x 4
            Pentium 60:     20000   x Memory  x 4
            486:                20000   x Memory x   3
            386:                20000   x Memory x   2