A quick
Google.com/linux search only came up with 3 matches, all of which say that Linux isn't supported by Lexmark, and that the people in question had problems printing with it. The only place that I can think of that might help would be
www.linuxprinting.org, but they don't seem to list the Z56. I do believe that perhaps the Z56 is a WinPrinter, in the same league as WinModems. Sorry.