Donkey, often known by its filename DONKEY.BAS, is a video game written in 1981, and included with early versions of the IBM PC DOS operating system distributed with the original IBM PC. It is a top-down driving game in which the player must avoid hitting donkeys. The game was written by Microsoft co-founder Bill Gates and early employee Neil Konzen. Although on the game's title screen it is simply named Donkey, it is often referred to by its filename of DONKEY.BAS. All BASIC programs used the ".BAS" extension, and MS-DOS compatible operating systems that came before Windows 95 display file names in upper case. These conventions are often maintained when the game is referred to in writing. Gameplay DONKEY.BAS is a simple driving game in which the player controls a car but cannot steer, accelerate or brake, only changing lanes to avoid a series of donkeys on the road. There is no goal other than to avoid donkeys. The game uses the CGA display mode, the only colour graphics mode available on the original IBM PC. The mode allows four colours but in DONKEY.BAS there are usually only three on screen. The center of the screen shows a vertical scrolling road with two lanes; the areas either side of the road are used for scores and instructions. The player's car is driving up the road and every few seconds a donkey will appear at random on one side of the road at the top of the screen. As the donkey moves down the screen, the player can press the space bar to switch between lanes to avoid the donkey. If the car hits the donkey, both car and donkey explode, and parts of the graphics are scattered to the four corners of the screen to the sound of a short monophonic tune played through the PC speaker, with the word "BOOM!" displayed on the left side of the screen. If the player avoids the donkey, it will scroll off the bottom of the screen, with the words "Donkey loses!" displayed on the right side of the screen, and after a few seconds another will appear. There is never more than one donkey on the screen at any one time. The game keeps score between the player and the donkeys. If the car hits a donkey, the donkey gets a point and the player is returned to the start of the