i have win 7 64 bit desktop with only serial port, com1 i guess. I have an old HP 5P laserjet that has an lpt1 parallel printer cable securely attached to it. i tried to connect a couple of adapters to the cable and plug it into the com port. I don't get any errors and it doesn't print. i took the driver from the hp site. do i need to change the com port settings (baud rate, etc...? what am i missing?