Image above: This is a program for calculating pi by Archimedes method.
Finds an approximation of pi by determining the length of the perimeter of
a polygon inscribed within a circle with radius equal to one.
It begins with a polygon with 6 sides where the radius of the circle is equal
to the side length and double the sides of the polygon each time, recalculating
pi as a half of the new perimeter. (Image taken from sim41w version 2.2.1)
I wrote my first HP 41 emulator for DOS operating system at years 1994-1995.
The emulator was published on Internet at 1995 .
I created "The hp41 emulator page" on www.geocities.com at year 1995.
Since 2009, geocities.com is off line, so , I translated the html pages here.
At year 2004 I began to write an HP41 emulator for Windows, updating
the old DOS code. Later I decided to write more emulators for the
HP family of calculators, beginning with the HP67.
I began to write the MyRPL programming language at year 2016.
At the end of may 2021 i began to write the Focal-2D programming language.
Preview versions coming soon on this site
You will find all these programs here.
Comments and questions welcome . Please, excuse errors in English usage.
You may help to the evolution of these emulators and MyRPL. If you find an error on
them, e-mail me. Thanks.
Alvaro Gerardo Suárez
Former member of the directive staff at Mensa Society
All the software present in these pages could be tested with Oracle Virtualbox and
a free image of windows 7 32 bit for virtualbox provided by Microsoft at http://www.modern.ie
You need a computer with windows 10 and at least 4 Gigas of RAM.
1) Download and Install VirtualBox.
https://www.virtualbox.org/
2) Download the windows 7 image.
Go to: https://developer.microsoft.com/en-us/microsoft-edge/tools/
Select: Virtual machines. Choose the machine and download it.
Unzip the file and rename the .ova file to .ovf file
For example, if you downloaded IE8.Win7.VirtualBox.zip, unzip and rename: IE8 - Win7.ova to IE8-Win7.ovf
3) Import the image to virtualbox.
Go to the virtual box menu and select: import appliance
4) Enter to the windows 7 image (also known as virtual machine), start it and navigate to this site
For example: navigate using IE8 provided in the virtual machine.
5) Download and install the runtime to the virtual machine, from this site
http://sim41.webcindario.com/runtime.htm
6) Download and Install the calculators or MyRPL on the win7 image.
Color number to RGB (2024-08-24)
The screenshot shows the program TORGB for SIM41. The data entry is:
ColorNumber [XEQ] [TORGB]
Color number between 0 and 16777215 Returns:
red component in register Z
green component in register Y
blue component in register X
This program is useful when working with colors on easy plotter
RGB to color number (2024-08-24)
The screenshot shows the program FROMRGB for SIM41. The data entry is:
red [ENTER] green [ENTER] blue [XEQ] [FROMRGB]
red , green and blue are integer numbers between 0 and 255
Color number obtained between 0 and 16777215
Creating archs (2024-08-23)
This screenshot shows how to build a custom arch with certain angle on (sim41e)
The example paints an arch with angle= 60 degrees
Creating spirals (2024-08-20)
This screenshot shows a program to draw an archimedes spiral with sim41 extended (sim41e)
[ IMPORTANT NOTE: If you have problems downloading files from this site with Chrome,
I tested downloads ok with Firefox, Microsoft Edge, Opera navigator, Pale Moon and others. ]
(2019/11/30) - Programs at https://www.hpmuseum.org/rpl.htm were tested OK.
(2019/11/30) - Program examples available at wikipedia (RPL language) were tested all OK.
(2019/11/30) - Discovered an issue in magic creator when loading buttons. Workaround:
A message appears when trying to load a file with button definitions. The choices are Accept or Ignore.
Press Ignore and all is fine.
Tip: When assigning variables to buttons allways check out
if the foreground color (fore_color) is different to the background color (back_color).
Obviously, if the colors are equal, nothing is seen in the button.
To assign an internal command as SIN to an empty assignable button: First
create a unnamed program variable with the command.
Example: << SIN >>. Enter
Later store the program variable to the variable name SIN.
Write SIN and press the button
STO
Note that in this case, SIN is an internal command linked to a variable name
with the same name.
Go to view buttons. Assign the program variable SIN to a button number.
Press Ctrl and W of your PC keyboard at same time to save the assignment.
Optional: Change the button background color with mouse right click
Magic creator has 100 empty assignable buttons. Only variables could be linked
to buttons. Shift0 shows the first 25 buttons, shift1 shows buttons 26 to 50,
shift2 shows buttons 51 to 75, shift3 shows buttons 76 to 100.
