An IDE for developing HP41C programs on a PC and creating HP41C barcodes.

Refurbishing the 82143A Thermal Printer
The HP-41C Wand
The HP-41C card reader
HP-41C modules
HP-41C links
hp41.org This is the online resource for information and software for the HP-41C series of calculators
The Museum of HP Calculators A vast store of information, manuals and software for HP calculators from 1968 to 1986.