View and Download HP -41CX quick reference manual online. I have used a physical HP 41 calculator for many years, and I still have one which is working. This is an HP-41CV simulator for MAC OS X. The keyboard had an 'Alpha' key that toggled the keyboard between alpha and the normal calculator mode. The HP-41C overcame these limitations by adding alphanumeric capabilities to both the display and keyboard. HP was running out of keyboard space for new functions, and many users found it difficult write and use numeric-only programs. It had three shift keys and most of its other keys had four functions.
The was an excellent example of the problem.
The human interface was becoming an even greater barrier to adding more functionality.
HP-41C The Museum of HP Calculators HP-41C/CV/CX Around the time of the, an article in the Hewlett-Packard Journal, stated that electronic technology was no longer the only limitation of pocket calculator progress.
