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CU Amiga Super CD-ROM 4
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CU Amiga Magazine's Super CD-ROM 04 (1996)(EMAP Images)(GB)(Track 1 of 3)[!][issue 1996-11].iso
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magazine
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psion
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utils
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basecalc.lzx
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basecalc.txt
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1994-04-01
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Install
Copy BaseCalc.opa to the APP directory on any drive and install with
<Psion>I.
Note: Use the outline feature in Word for table of contents.
General Overview
BaseCalc displays a 32 bit number in 4 "bases" across the screen. The
"bases" are ASCII, binary, decimal and hexadecimal. The display is set up
as a "scrolling tape" so results from previous calculations show. Grey grid
lines are used to section large numbers and to mark the result of a
calculation. The operator is shown in the last column
There is one input window that can be moved to any of the four columns by
using the left or right arrow keys. This location determines the base in
which you input your numbers.
The processing of numbers and operators are Reverse Polish Notation (RPN
or postfix notation) and is modeled after Hewlett Packard (HP) calculators.
To add two numbers input the first number and press <Enter> (set the
accumulator) input the second number and press <+> the accumulator (first
number) and the second number are then added together and the result is
shown (which is now in the accumulator.) A more detailed explanation of
this and other internal registers are in a latter section.
A brief description of keys and functions are available in the program
when you press <Help>. I would advise to read the ASCII section before
seriously diving into the program since its use and behavior is not
immediately obvious.
Note: BaseCalc uses no files (just like Calc.)
About
Pressing <Psion>A display the BaseCalc version number, copyright notice
and a plea to register the software. I have a family of four loving kids
and wife. They all depend on me for financial support. I can really use the
money, or a decent job offer.
Registration will get you a version of the program without the nag screen.
After years of putting up with other peoples programmers calculators and
wishing they would do more. I finally put together my own. I hope you enjoy
the ideas and functionality I tried to put into this package. If you have
any complaints or suggestions feel free to write or call.
Barry Childress
3415 North Second Street
Harrisburg PA 17110
Phone (717)234-0750 Compuserve 73510,1420
In case you were wondering the program's icon is a truth table for And (&)
Xor (^) and Or (|).
I would like to thank Cade Roux for his ideas on the ASCII input.
Features
Most features are accessible through the <Menu> key or with the Psion
short cut key. A brief help screen is also provided.
* The amount entered is defined as a number in the input window before an
operation is selected.
General Keys
The left and right arrow keys select which base that you want to enter
your numbers in. Note: it is possible to overflow the 32 bit register with
a decimal number.
<Esc> Clears the accumulator. See <Psion>-C to clear all registers.
<Psion>L Sets the accumulator to the result before the last operation.
This works like a single level undo.
<Psion>X Exit BaseCalc.
Math operators
Note: If no number is entered the stack is popped and the 2nd accumulator
on the stack becomes the amount entered (The accumulator remains the same
before the operation.)
+ Adds the amount entered to the accumulator.
- Subtracts the amount entered from the accumulator.
* Multiplies the amount entered by the accumulator.
/ Divides the accumulator by the amount entered.
# Sets the accumulator to the amount entered power.
Note: If a number does overflow the accumulator is cleared and an E is
displayed in the right operator column
Binary operators
These operators work the same way the math operators work on the
registers. Except for ~ (not) which is a urinary operator and its operation
is explained below.
Note: The icon for BaseCalc is the truth table for the first three
operations.
& And the accumulator.
\ Or the accumulator (the | symbol is used in the right column .)
^ Exclusive or (xor) the accumulator.
~ Not the amount entered and push it on the stack or if there is no amount
entered ~ is performed on the accumulator.
Shift bits
< (or ,) Shift the accumulator left by the amount entered or by the amount
on the stack.
> (or .) Shift the accumulator right by the amount entered or by the
amount on the stack.
Note: Bits shifted left beyond 32 bits can result in an overflow error.
Stack operations
Show <Psion>S
Displays the stack and Last register. The lines are noted with the
following symbols in the operator column:
L Last
... Bottom of stack (auto repeats)
3 Third item on stack
2 Second item on stack
Ï The accumulator
Last <Psion>L
The sets the accumulator to the last result that was in the accumulator
(undo.)
Exchange <Psion>E
Exchanges the accumulator with the second item on the stack. Or if there
is an amount entered it gets pushed on the stack underneath the accumulator
(the amount entered becomes the second item on the stack.)
This helps correct the order of items before an operation such as divide
or power.
The operator symbol is X.
Pop <Psion>P
Pops a register off the stack (discards the current accumulator.)
Clear All <Psion>C
Clears all registers.
The operator symbol is A
Examples:
In going through a VGA programming example book I ran across this example
of a bit pattern for a striped rainbow effect that had me a bit puzzled
till I entered the numbers in BaseCalc and looked at the "sideways" in the
binary column. Try entering the following numbers in Hex and see if you can
see the bit pattern.
CCCC CCCC
F0F0 F0F0
FF00 FF00
FFFF 0000
RPN
To add 1+1
1<Enter>
1+
Constant numbers
To use a number as a constant, push it on the stack four times so as it is
popped off it repeats in the forth stack register.
1<Enter><Enter><Enter><Enter>
< (Shift right by 1)
< (...)
(Shows the powers of 2)
ASCII
One use for the ASCII column is to find the ASCII value for a key. With
the input window in the ASCII column (small window on the left) press the
key you want to find the value of and then press <Enter>.
You also can use ASCII values in operations. To find the difference
between upper and lower case letters:
a <Enter>
<Shift>A -
Converting a Hex string to its value is generally a two step process where
you first subtract the value of ASCII "0" and if the result is larger then
nine then it is a A-F digit. The calculations would go like this:
<Shift>A <Enter>
0 -
(move to Dec column and subtract what the value should be.)
10 -
Or the same thing without moving the input window.
<Shift>A <Enter>
0 -
<Control>010 -
<Control> xxx inputs the ASCII character with the decimal value xxx.
Now lets double check against the Hex digit F.
(move back to the ASCII column.)
<Shift>F
0 -
- (This subtracts the 7 from our last calculation.)
And we get F in the Hex column.
You can also use the ASCII column to get the codes for any key on the
Psion by first pressing <Tab> then the key you want the code for and
finally <Enter> or any other operation key.
Notes:
You will also need to press <Tab> first if you want to enter one of the
operators (+-*/\~^&<>,.).
You can use <Control>A as a quick way to enter 1. <Control>A through
<Control>Z are ASCII codes 1-26 but some codes are taken as regular key
presses (8-Delete, 9-Tab, 13-Enter and the system swallows ^S and the next
key.)
Copyright
BaseCalc is Copyrighted 1994 by Barry Childress All rights reserved. The
program may be distributed provided all documentation remains intact and
fees for distribution do not exceed $7.