Unable to change logic on parallel port

[Gyro]

I am using Outport from accesshw with LV6.1 to control logic staes of parallel port. The port LPT1 does not repond to the program. On changing the address to LPT2 and switching the device to this port (additional PCI parallel port on the comp.) everything seems fine. Just the LPT1 wont work.. Any ideas why this might be?

[mlenz]

If you have a printer installed on your machine, perhaps it has "grabbed" the port and it is inaccessible to other programs. Try uninstalling your printers to see if this is the case.

[Gyro]

Thank you for your response. It is certainly one of the things i checked, but finally this is how the problem was solved, which i would like to share for anyone else who might have the same experience..
The BIOS setting for LPT1 was set to bidirectional, since i was successfully using this program on a previous computer i checked the BIOS setting on that PC and it was ECP, changing the LPT1 to ECP in the BIOS did the trick although i am not sure why!
I would welcome if anybody can explain the details...
Thanks