I owned one. The combo was Ctrl-Alt-Minus. There were a lot of DOS games that were designed to run at exactly 4.77Mhz. The gameplay and music would run at 2x i

I owned one. The combo was Ctrl-Alt-Minus. There were a lot of DOS games that were designed to run at exactly 4.77Mhz. The gameplay and music would run at 2x if you enabled turbo mode.