This is a collection of programs &c related to the (obsolete) HP41C/CV/CX, HP-71B and HP-75C/D handheld computers and HP-IL, Hewlett-Packard Interface Loop.

This is still experimental and may be reorganized, moved to another location or terminated without prior notice, and nobody assumes any responsibility of any harm caused by the use of any materials herein.

Copyrights of various programs generally belong to their respective owners and no specific rights are guaranteed or implied by their inclusion here.

Comments, notices about copyrighted material that should be removed, offers for additions &c should be directed to Tapani Tarvainen <>. There is no anonymous upload directory but means for upload can be arranged on case-by-case basis on request.


swap: collection of "swap disks" circulated in users' clubs.

hplink: drivers for the HP82973A HP-IL Interface Card.

hpillink: another set of drivers and utilities for the HP82973A, especially for HP71B.

lifutil: utility program for handling LIF disks on a DOS PC HP41/71/75 use LIF format with HP9114 floppy drive).

lif2dos: more utilities for handling LIF disks on a PC.