also: tinyurl.com/griffenfly

Downloading and Installing

note:This slide rule was once shareware, but it is now 100% freeware. There is no limited trial version, no license key or fee required. Share it with your friends, whatever. Just don't sell it.

Jump straight to the actual downloads


The installation instructions are divided into the the following steps:

1. Pre-install the Java Runtime Environment (JRE™) 5.0 or higher

(Skip this step and the next one if the JRE™ 5.0 or higher is already installed)
The JRE™ is a well known third-party software system from Sun Microsystems, upon which the Griffenfly Rule is built. It isn't bundled in the product because it's quite a bit larger (around 16 M ). This environment is very useful to have, enabling all kinds of other applications. It's free and the install is simple and well documented.

Get it here.

2. Check that the Java Runtime Environment (JRE™) 5.0 is installed

On Microsoft Windows™ Platforms
Activate Start Menu/Settings/Control Panel/Java/About
If this can't be found, it wasn't installed.
If the first line isn't "Version 1.5.0 ..." or greater, you'll need a more recent version.
(Yes, that's 1.5.0, discard the first "1." to get the documented version.)
On any platform with a command interpreter shell
(this works fine with the Windows™ command prompt.)
Run the shell as the user that intends to run the slide rule.
In the shell, type java -version
Verify that the first line of the printout ("java version..") is 1.5... or greater.

3. Download the Griffenfly Universal SlideRule

Once the JRE™ is installed, pick an installation type from the list below, and download it to your computer.
Build 144 Executable Installation Program ( Microsoft Windows™ only )
gusr_setup_144.exe 876 KB
Build 144 Tar Archive ( for any platform with the tar command )
gusr_144.tar 882 KB

4. Install

In these instructions, the build numbers on the files will be written _nnn, so, for instance, if the instructions refer to gusr_setup_nnn.exe, it means to use your downloaded file with a similar name, for instance gusr_setup_136.exe.
It is fine to install overtop of an existing installation. This will not harm your collection of virtual slide rules.
Installing from the Executable Installation Program
Run the downloaded gusr_setup_nnn.exe program by clicking it in any file browser window.
The installer will prompt you for the installation directory.
The installer will give you the usual options for Start Menu entries and desktop icons.
You will have the option of launching the slide rule directly from the installer.
Keep gusr_setup_nnn.exe, in case you need to re-install.
Installing from the Tar Archive
Using a shell or command prompt:
Create a new, empty directory to hold the installation,
Place the downloaded gusr_nnn.tar file in this directory.
In this new directory, issue the command tar -xvf gusr_nnn.tar
Keep gusr_nnn.tar, in case you need to re-install.

5. Run

If you installed from the Executable Installation Program
Just click on the "Universal SlideRule" desktop icon or Start Menu item. You can also directly run the executable gusr.exe found in your installation directory.
If you installed from the Tar Archive
Open a command shell
Go to the installation directory
Run the script gusr
You can create a script or icon which performs these commands, but no tutorials will be provided here.