OK,

To start out, I am merely posting an outline as I see it, of calculator logic systems as currently in use.

This is "Part Ia" because of my previous post:

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv013.cgi?read=38678

The idea here is that I will first post this, so everyone can see it, and then in a few days I will post my "treatise" as it were.

Please post any glaringly obvious omissions, and i wil ledit this list (within my prerogative, of course) so that we have a nice "seminar outline" as it were....is this getting to be too academic; oh well!

Note that I am trying to stay away from the more advanced and specialized features---this icludes PMT IRR etc on financials, Statistics, unit conversions etc on scientifics etc.

Best regards,

Bill Platt

Calculator Operating Systems: (Leaving out matrices and other special or utility functions eg conversions, units etc)

Group 1: Stack Based

RPN (postfix except for register work which is infix)

programming is essentially machine code level

RPL (postfix everything)

programming is essentially high-level (except assembler hacking!)Variations:

stack depth

variable handling

data types

exponentiation direction of entry

compex number handling

register handling

register arithmetic

programming features

statistics/special features handling"Adding Machine" (in between group 1 and 2)

postfix for addition and subtraction; infix for multiplication and divisionGroup 2 (also known as "Direct Calculation" as opposed to "Formula Entry")

"Algebraic with precedence" with postfix "1 number functions"

"Algebraic" without precedence (and postfix "1-number functions")

Ordinary 4-function infix arithmetic, postfix "1-number" functions)Variations on algebraic:

"history" stack

"last" (sometimes called "ANS")

"swap"

"input" for "2-number functions" and other special features (e.g. statistics)

handling/display of intermediate results

chain computation

computation with a constant

complex arithmeticNote that these variations are by no means universal. The meaning of "swap" "k" et cetera may differ greatly from one maker to another or even from one model to another.

Numerous variations exist on the handling of:

clearing & cancelling

m^n (y^x, x^y, x_Root-of_y etc)

%

statistics

permutation & combination

variables and or registers or memories

register/memory arithmetic

programming rules

use of parenthesis in non-precedence machinesGroup 3: Formula Based

"Formula Entry" (infix everything except usually x^2 is usually postfix and y^x is infix)

"Formula Entry" with "implicit multiplication" (again infix everything except x^2)Variations on Formula Entry (Sometimes called "direct algebraic logic," "visually perfect algebraic logic" etc).

history stack

scrollable edit

intermediate results

use of previous results ("ANS")

*Edited: 11 June 2004, 2:25 p.m. *