HP-15C, and the improvement over the HP-11C Message #10 Posted by Karl Schneider on 2 Aug 2009, 3:28 a.m., in response to message #7 by Katie Wasserman
Quote:
However, if you ignore the features on the 15C that the 11C does not have (matrix operations, complex math, etc.) the only usability differences are that most of the tests (x<0, etc.) on the 15C have to be looked up on the back of the calculator. All of the un-shifted and most of the shifted functions are assigned to the same keys on both calculators.
Hi, Katie --
Yes, that's exactly right. H-P actually managed to slightly improve the arrangment of functions on the keyboard of the HP-15C over the HP-11C, even as four major elements of functionality were added using the same keyboard. Great thinking and engineering!
The broad set of functions on the on the HP-15C required intelligent use of two-byte operation codes where necessary. (The HP-11C and HP-34C used only one-byte keycodes, which explains why some reasonable functions were curiously missing from each.)
A thread from 2006 with many contributors:
HP-34C/11C instruction codes (corrected)
Essentially, when the HP-15C was introduced, the fine HP-11C was eclipsed, superseded, and supplanted, except maybe to occupy a price niche.
Here's a detailed discussion from three years ago:
HP-15C functionality and keyboard layout
-- KS
Edited: 2 Aug 2009, 3:42 a.m.
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