I've got a 41cv for exploration, and no literature to go with it. I see three HP publications on TAS right now:
http://www.ebay.com/itm/190588555418?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648
http://www.ebay.com/itm/280759260940?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648
http://www.ebay.com/itm/280759262115?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648
How useful might each of them be? (I can guess, of course, given their descriptions.)
What other publications might be useful?
Thanks for these and any other suggestions on exploration.
Oh, and where might I pick up a fourth port cover, the calculator having only three at present?
Edited: 23 Oct 2011, 11:20 a.m. after one or more responses were posted