This simulation runs at 64Kb of RAM, a CGA display, and a clock speed of 4.77MHz–the original configuration of IBM PC Model 5150.
http://www.pcjs.org/devices/pcx86/machine/5150/cga/64kb/donkey/
source http://fossbytes.com/donkey-bill-gates-world-first-computer-game-basic-online-pc/
origin - http://www.pipiscrew.com/?p=5980 pc-game-in-1981