I quote "Benefits of PDL printing Laserjet 2420N
Host-based printing requires a software print engine in the host operating system, and unlike a PDL (Printer Description Language) printer, cannot accept ASCII text direct from a computer. This means that the Host based printer will only work in the Microsoft Windows and Macintosh environments that are specifically supported with the print engine written for that environment.
Users of unsupported Microsoft Windows and Macintosh environments, as well as users of Linux, Unix, and OS/2 should consider a PDL printer like the HP Color LaserJet 2500, HP Color LaserJet 3000, HP Color LaserJet 3700, HP Color LaserJet 3800, and HP Color LaserJet 4700 series printers.
I fear this will not work on HP-UX
Divide and Conquer