By chance a fellow who works for me recently gave me his Dad's mint hp48g complete with all manuals including the advanced users guide. Normally I am Beam prop or mathematica type of guy but I did write some simple stuff for my now long lost hp 28-s.
I became intrigued and have spent more then a few hours & plane rides working through the manuals. So far I wrote a couple simple programs to entertain & seemingly convert my 12year old to RPN!, they pop up a menu, ask her by name for input values , run a calculation with local variables assigned to the stack pulls and then tag an output value. She now borrows the HP to use the RPN style key strokes for her geometry homework. I can't be happier :)
In any case I came across a rather brilliant set of utube videos by rolinychupetin on the HP 49g+->( seems close enough for the 48 series as well). So far have just worked through the first two but they were entertaining enough to plunk down 75 dollars on an Hp50 from new egg just to see the differences between the calculators. Personally I think the series is well worth the watch and really recommend it. Also I thought 75 dollars was a decent price and worth passing along. Haven't received yet but the enter key seems weak and lonely in the bottom corner, not where I would have put it for two handed use..
Curious to see how the Hp50 compares to the 48g for my occasional daily use & writing small programs for simple stuff like converting % weight of chromophore loading into number density & some thin film optics lab number crunching during running discussions with my colleagues.
Lou