Earlier versions of HP-UX supported the HP Integral PC and HP 9000 Series 200, 300, and 400 computer systems based on the Motorola 68000 series of processors, as well as the HP 9000 Series 500 computers based on HP's proprietary FOCUS processor architecture.
Ранние версии также работали на процессорах HP 9000 Series 200, 300 и 400, основанных на семействе процессоров Motorola 68000, и HP 9000 Series 500 собственной архитектуры HP FOCUS.