The IBM System/360 Model 50 was a popular mainframe introduced in 1964. This page simulates this computer by running its original microcode.
The console lights are illuminated as they would be on an real Model 50.
To start the simulator, click the Run button above.
Click a roller knob on the right of the console to change the display.
Zoom in on the console for more detail.
See the Model 50 blog post for background.