Links

HP:

http://www.hp.com

50g at yahoo groups:

http://tech.groups.yahoo.com/group/50g/

hpcalc.org:

http://www.hpcalc.org/

A good intro to RPN on wikipedia:

http://en.wikipedia.org/wiki/Reverse_Polish_notation

HP 48 newsgroup:

comp.sys.hp48

The museum of hp calculators

http://www.hpmuseum.org/

Prof. Dr. Wolfgang Rautenberg

http://page.mi.fu-berlin.de/~raut/

Gilberto E. Urroz

http://www.engineering.usu.edu/cee/faculty/gurro/Software_Calculators/Calculators.htm

See also resources