Area Trimming in AutoCAD with Large Format Tablets

A.   What is Area Trimming?

     1.   There are some reports of "trimming" on the large format digitizers when used with AutoCAD 12 and 13 for DOS
          and Windows.  The AutoCAD drawing editor will only recognize 35,000 unique points on either axis. With the
          default setting at 1000 LPI (lines per inch), a 48"x36" board will have about 13-inches on the x-axis and 1-inch on
          the y-axis that would not be recognized. 

B.   If the full area of the board is required to digitize and losing resolution is not an issue, then set the digitizer
      resolution to 500 LPI. Perform the following steps.

     1.   Click on the CONFIG/EXIT button on the menu strip of the tablet.

     2.   Click on BANK A.

     3.   Configure the following switches:

          Switch:  9 = On,  10 = Off,  11 = Off   

     4.   If you want to save these settings permanently, click on SAVE DEFAULT,2, or 3 on the tablet menu strip.

     5.   Click on the CONFIG/EXIT button on the tablet menu strip to exit.


C.   If resolution is an issue when using AutoCAD for DOS, then set  the maximum resolution available automatically
      upon starting the application. To accomplish this, perform the following steps.

     1.   Add the following line to the ACAD.BAT file.

          a.   Switch to the AutoCAD directory (i.e., CD C:\ACAD).

          b.   Type  EDIT ACAD.BAT

          c.   Add one of the following commands to the end of this file, depending on the size of the tablet:

               ----- Command -----
               ECHO %%JR970,0>comx         24"x36"
               ECHO %%JR725,0>comx         36"x48"
               ECHO %%JR580,0>comx         48"x60"                

               where "x" = com port number

          d.   Press to go to the FILE menu and select EXIT.

          e.   The editor will then ask you if you want to SAVE this file.  Press the Y key.

          f.   Restart AutoCAD.