Microtouch and Xorg

Hi all. I was wondering if anyone has any experience calibrating a Microtouch Serial/SMT3 touch screen device for Xorg. I was able to find a tool to calibrate elographics touch screens (from the author of the touch screen howto) but it is ineffective with microtouch.

Code:

---

# Section "InputDevice"
#    Identifier "touchscreen0"
#    Driver    "microtouch"
#    Option    "Device"        "/dev/ttyS0"
#    Option    "MinX"          "1412"
#    Option    "MaxX"          "15184"
#    Option    "MinY"          "15372"
#    Option    "MaxY"          "1230"
#    Option    "ScreenNumber"  "0"
#    Option    "ReportingMode" "Scaled"
#    Option    "ButtonNumber"  "1"
#    Option    "SendCoreEvents"
# EndSection

---

these are the default values from a sample xorg.conf file. Notice that the Min-Max values are reversed. MinY is roughly the same value as MaxX. With these values, at 600x480,800x600, and 1024x768, the calibration is off.

Code:

---


--------------touch screen area-----------------
 I                                              I
 I  ########visible monitor area##############  I
 I  #                                        #  I
 I  #                                        #  I
 I  #                                        #  I
 I  #                                        #  I
 I  #            *2                        #  I
 I  #                                        #  I
 I  #                      *1              #  I
 I  #                                        #  I
 I  #                                        #  I
 I  #                              *3        #  I
 I  #                                        #  I
 I  #                                        #  I
 I  #                                        #  I
 I  ##########################################  I
 I                                              I
 ------------------------------------------------

---

*1 if I touch the screen in this position the cursor is aligned with the area that I touched. When touching the monitor anywhere else, the alignment progressively degrades from this point in any direction.

*2 the alignment is off.. the courser position is offset low and to the right of the point pressed

*3 High and left.

(this result is achieved at any resolution)

I have tried the trial an error approach with little success. I can't distinguish any pattern when changing the MinX & Y or MaxX & Y. Xorg provides little documentation (that i can find anyway) on thier microtouch driver. Prior to using this monitor, I had used an EloGraphics device that I was able to calibrate by using the touchcal program. Touchcal does not work with the microtouch device I am using though the author says it is compatable. I took a stab at trying to decipher the raw serial output of the device without success.

Any help would be appreciated.
Thanks