Throttle Blaster P3 550mhz running at 8mhz set over serial. 

Throttle Blaster from Scrap Computing github.com/scrapcomputing
LaunchBox for MS-DOS is the game menu
Kermit to control the Throttle Blaster over RS232
LaunchBox calls a batch file that sets the Throttle Blaster to 8mhz over RS232 before launching Tapper the 2nd time. First time is running at the full 550mhz which is unplayable.
www.thingiverse.com/thing:661... SVGs available