printer driver for HP-GDI printers

 Using pnm2ppa it's possible to run HP-GDI printers on Linux. These printers
 are normally "Windows-only" and use the PPA protocol which is proprietary.
 pnm2ppa supports color.
 .
 pnm2ppa supports the following printers: HP Deskjet 7XX Series, HP Deskjet
 820 Series and HP Deskjet 1000 Series.