|Re: the HP-65 required more from the user|
Message #10 Posted by Michael de Estrada on 5 Aug 2011, 1:07 p.m.,
in response to message #1 by Don Shepherd
key_____ F___________ F-1
1_______ R->P________ P->R
2_______ D.MS+_______ D.MS-
Anyways, I never found this system to be very convenient and never understood why HP adopted it, since all their other calcs, such as HP-55 and HP-67 use the f (yellow) and g (blue) shift convention with all the legends being shown. It doesn't really simplify anything, since it has the same number of keys and shifted keys as the HP-67. I imagine that's the reason HP abandoned it on subsequent models.
Interestingly, some non-HP calcs also use this system, such as the Mostek chip based RPN calcs (Corvus 500, Omron 12SR, APF Mark 55 etc.). I find that there is always a slight delay as my brain tries to remember what the inverse function is for one of the missing legends.
As to the octal "feature", I can only say wow ! That's pretty nerdy.
Edited: 5 Aug 2011, 1:12 p.m.