Bios password needed to change parallel port settings!

I need to change parallel port setting to EPP. 

I want to use this machine now to drive a small milling tool which requires a parallel port.

Machine Optiplex 780 small factor Service Tag:   Express Service Code:

Machine connect to Dell and diags has been passed... and port is actually PS2 type...

Could I have code to unlock it?

Thank`s!

Louis