Serial Port Question...
 

All, I'm trying to sync a Handspring Treo 90 Palm device with my Linux System. I gave up on USB (because of a driver bug with sequential access devices) and switched to a serial cable. My problem is, I can't determine which serial port is activated when I launch the hotsync process on the device. Does anyone know how to tell which port is activated?

If the serial port is being used a serial interrupt will register in /proc/interrupts. You can check that file repeatedly with: watch cat /proc/interrupts. If it doesn't appear then you're not actually communicating through the serial port. If it does appear during the hotsync note the IRQ. IRQ 4 is usually COM1 (/dev/ttyS0), IRQ 3 is usually COM2 (/dev/ttyS0).