The simulation lets you play against the machine just as one could against the original, and it has slow and manual modes that will display the instruction steps as they are executed.
It may also be of interest that, internally, the program is built like the original. The logic is performed by "Gates" and "Flip-Flops", just as in the hardware. (Except of course that the 'parallel' logic has actually to execute sequentially . And only the 'game engine' is programmed this way. Interaction with the user is through more conventional GUI techniques.) Where a detailed description of the original logic was available, the simulation follows it almost exactly.
You can download a standard zip archive of the complete package
below. (Although the program only runs under BeOS, the accompanying
extensive documentation is in HTML form, and might be of interest
to some.) The archive is freely distributable at no charge.
nimrod.zip (384KB)Download the archive for ppc BeOS R5 here:
nimrod_ppc.zip (354KB)PLEASE NOTE: The program needs R5 of BeOS to run.
The archive is a 'zip' file which will unpack (using some variant of the 'unzip' program -- available for all operating systems) into a single NIMROD folder, which you can place anywhere. You'll need a little under 500K of disk space to hold it.
If you are interested, you should note that there is a free version of the OS available, and that, moreover, this can be installed as a file in your Windows system, and run from there. (You will need 500MB free space to hold it, though.) You can find this at:
http://www.bebits.com/app/2680