Several simulations of early machines are present within these pages:
Requirement: The simulations are ShockWave programs and require the MacroMedia ShockWave plug-in for your browser. If your browser is not set up to run the simulations, clicking a RUN button should take you to the Macromedia web page to download the plug-in.
Suggestion: On smaller display screens you may be able to improve the display by minimizing browser tool bars and such. In Netscape, click on the dotted bars at the left of the tool bars.
Some more simulations are present in the EEC pages.