Solution:

I. Make sure COM 4 (IRQ 5) is available. Type command " setserial -g /dev/ttyS3 " to check if COM 4 I/O address, and IRQ settings are correct. If they are not you've to change them to 2e8, and IRQ5. To add " setserial /dev/ttyS3 irq 5 " to the file " /etc/rc.d/#rc.local# ", it will allow the settings take effect after system booting; otherwise, you've to modify the settings every time. II. ELo Touchscreen Driver Installation 1. Install Linux. Verify the XFree86 X-Windows manager is operating to your satisfaction. 2. Verify the following Elo touchscreen driver file exists: /usr/X11R6/lib/modules/xf86Elo.so 3. Edit the following XFree86 X-Windows configuration file: /etc/X11/XF86Config Make the following changes: 1. Verify the Files section contains the following path: *** Files Section *** Section "Files" . . ModulePath "/usr/X11R6/lib/modules" . EndSection Note: This path is generally the default path of the system, so the change may not be necessary. It is also possible to write the full path directly in the Load command in the Module section. 2. Enable the Module section: *** Module Section *** Section "Module" Load "xf86Elo.so" EndSection Note: It is also possible to write the full path for xf86Elo.so. 3. Enable the XInput section: *** Xinput Section *** Section "Xinput" SubSection "Elographics" Port "/dev/ttyS3" DeviceName "Elo" MinimumXPosition 300 MaximumXPosition 3700 MinimumYPosition 300 MaximumYPosition 3700 UntouchDelay 10 ReportDelay 10 EndSubSection EndSection Note: A standard XF86Config file may not contain this section Xinput. Hence you may need to create it! This section can be safely placed after the Pointer sect