It is one of the main printing codes for windows. Works well with PCL Drivers. From what ive seen in my time troubleshooting
As PCL is a Microsoft printing code. If you are using Word,Excel, or any microsoft applications to print PCL or PCL 6 would be the best option.
Yes, the PCL6 driver found on the Drivers and Downloads page for the Phaser 6500 on xerox.com would be best. I hope that helps.