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1992-05-06
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ProCalc - programmable calculator
Overview
The program ProCalc simulates a programmable
calculator based on the HP11C from Hewlett-Packard.
This document describes only the differences bet-
ween the simulation and the original. For special
informations about the functions, please read the
Owner's Handbook for the HP11C (Hewlett-Packard
Part Number 00011-9001) or the german describtion
for this program. (Sorry, my english is not good
enough to translate that. Perhabs someone else will
do that for me.)
Differences simulation - original
- Not the same rounding characteristics: If the
digit to round is five, and there are no
digits following or only zeros: if the digit
in front of the digit to round is even,
ProCalc rounds up instead of round off; if the
digit in front of the digit to round is odd,
ProCalc rounds off instead of round up. These
are the correct rules to round a number. The
HP11C rounds up the digit five always.
- inaccuracies of trigonometric functions when
the correct result is zero. (This happens also
on the original.)
- x! : Gamma-function is not implemented at the
moment
(in fact: I don't know how to do it with a
simple and short algorithm). If you try it
with a real number, an ERROR 0 occurs.
- The program-memory takes always 249 lines.
There are always 20 data-registers (+ I-regis-
ter). There is no conversion between program-
memory and data-registers.
- The function STO RAN# don't exist. The calcu-
lation of a random-number don't need a star-
ting value.
- There are no check-function and (in this ver-
sion) no adjustment for the decimal-character.
But there are two different versions: a eng-
lish and a german one.
- ProCalc uses only short-cut key-sequences. The
f- and g-key starts always a new key-sequence.
A not-ended key-sequence will be erased.
- The MEM-function shows you only the number of
free programlines.
- After an ERROR, the ON-key is also locked.
That means, it won't turn off the calculator.
It deletes only the error-message like all the
other keys.
- Every function is started (or inserted in a
program) after you have released the specified
key (the last key in a sequence). Therefore
you cannot extend the message of the CLEAR-
PREF-, MEM- and in RUN-mode of the SST- and
BST-function by holding down the specified key
(as you can do it with the HP11C).