42S Description Features Screen Shots Documentation Development Documentation The ultimate documentation for Free42 is the manual for the original HP-42S. You can obtain this manual in PDF format by purchasing the CD or DVD set from The Museum of HP Calculators for a nominal fee. Alternatively, there is an independently written manual by José Lauro Strapasson and Russ Jones which is freely available for download at Thomas Okken’s Free42 site. Rayzzor Studios Steven Ray, Founder Contact: support@rayzzor.com Free Trial Download Now