Useful links

Software Mechanics
They have a plotter driver named WinLINE which supports wide range of the HPGL and HPGL/2 plotters and works under all kinds of Windows (Win9x/Me, WinNT4/2000/XP).

HP Computer Museum
A collection of old Hewlett-Packard computer hardware, software, documentation and other marketing materials from HP's early years in the computer industry.

cadraktiv gmbh
Services for AutoCAD and AutoCAD related issues.

The great software download site.