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1994-12-13
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!SciCalc Version 0.55 (13-Dec-94)
=================================
SciCalc is a scientific calculator which runs under
the RISC OS desktop. It offers 4 numeric bases,
3 trigonometric modes, a memory and a single level
of brackets. Its accuracy is limited to that of
BASIC 64, which it requires to run. Input can be
performed using the mouse and the keyboard.
Numeric range:
-------------
Decimal - Real values, -9.9E99 to 9.9E99 entry,
-9.9E307 to 9.9E307 displayable
Binary - 32bit signed, 10000000000000000000000000000000 to
11111111111111111111111111111111
Octal - 32bit signed 20000000000 to 17777777777
Hexadecimal - 32bit signed, 80000000 to 7FFFFFFF
Accuracy:
--------
Mode Accuracy Number of digits displayed
==== ======== ==========================
Binary Absolute 32
Octal Absolute 10 - 11
Hexadecimal Absolute 8
Decimal 64 bit FP 10 or 10 + 2 digit exponent
Note: real number underflow is not trapped.
Keys in decimal base:
--------------------
Calculator Keyboard Function
========== ======== ========
0..9 0..9 numbers
+, -, x, ÷, =, +, -, *, /, = standard operators
Return, Enter same as =
± # change sign on number or exponent
Exp E allows entry of exponent
. . decimal point
10x, LOG, LN, eX exponential and logarithmic functions
nCr combination
nPr permutation
() (, ) brackets (one level only)
TT the number Pi
RND random number between 0.0 and 1.0
NOT, AND, OR, EOR logical functions
% % percentage
HYP (followed by trig fn) hyperbolic functions
SIN, COS, TAN trigonometric functions
ASN, ACS, ATN inverse trigonometric functions
x! ! factorial
€x square root
y€x Yth root of X
x² square
xY ^ X raised to the power Y
1/x reciprocal
C Delete clear calculation
CE clear current number only
MC clear memory
Min memory in
MR memory recall
Mode select radians/degrees/gradians
Base select decimal/binary/octal/
hexadecimal base
Alternative keys in non-decimal bases:
-------------------------------------
NAND NOT AND
NOR NOT OR
EQV NOT EOR (equivalence)
<O , O> rotate left or right
<<< , >>> logical shift left or right
<< , >> arithmetic shift left or right
DIV integer division
MOD modulus (integer remainder)
A - F A - F hexadecimal base digits
Using the percentage key:
------------------------
47.3 + 15 % = to 47.3 add 15% of itself
15 % * 47.3 = find 15% of 47.3
Operator precedence:
-------------------
Operators are evaluated in the following order of precedence
(highest shown first).
unary operators
y€x
xY
nCr, nPr
*, /, DIV, MOD
+, -
<O, O>, <<, >>, <<<, >>>
AND, NAND
OR, EOR, NOR, EQV
The SciCalc window
==================
The title bar indicates the current base and, for decimal, the current
trigonometric mode. The SELECT and ADJUST buttons applied to the "Base"
and "Mode" keys cycle through the bases and modes in opposite directions.
The numeric display contains the most recently entered number or result.
Any errors, for example "Division by zero", are displayed here too.
To clear an error, use the "C" button.
Clicking in the numeric display turns the title bar a cream colour,
indicating that numbers and selected operators may be entered from
the keyboard. When the title bar is grey, the keyboard does not affect
the state of SciCalc.
Note that changing from decimal to a non-decimal base will round the
currently displayed value to the nearest integer, but has no effect on
previous parts of the current calculation. Rounding also occurs on numbers
being recalled from memory in non-decimal bases.
Start-up options
================
Double-clicking on the !SciCalc icon in a directory viewer installs SciCalc
on the icon bar. Clicking on this icon with SELECT or ADJUST opens the
calculator window.
You can optionally cause the window to be opened at a chosen place on the
screen when SciCalc is run, by setting the system variable SciCalc$Window,
for example:
*Set SciCalc$Window 700,900
The numbers are the x and y graphics coordinates for the bottom-left corner
of the displayed window.
You can also choose a particular base and trigonometric mode in which SciCalc
is to start, by setting SciCalc$Options, for example:
*Set SciCalc$Options 2,1
The first number specifies the base, the second the mode. Allowed values are:
Base - 1 Decimal
2 Binary
3 Octal
4 Hexadecimal
Mode - 1 Radians
2 Degrees
3 Gradians
The above example sets the base to binary and the trigonometric mode (used
when you next change to decimal base) to radians. The default values are
1,2 i.e. decimal and degrees.
Quitting from SciCalc
---------------------
You can quit completely from Scicalc by clicking MENU on the icon and
selecting Quit. Alternatively, to remove the calculator window temporarily,
click on the window's close box. Subsequently clicking on the icon will
re-open the window in the same position, with the calculation state
preserved.
Requirements
------------
SciCalc will only run if the following modules have been loaded or can be
found in the directory !System.Modules.
FPEmulator version 3.40 or later.
BASIC64 (BBC BASIC VI) 1.05 dated 19 Jan 1990 or later.