AppleWin (also known as Apple //e Emulator for Windows) is an open source software emulator for running Apple II programs in Microsoft Windows. AppleWin was originally written by Mike O'Brien in 1994; O'Brien himself announced an early version of the emulator in April 1995 just before the release of Windows 95. Development of AppleWin passed to Oliver Schmidt and is now maintained by Tom Charlesworth. AppleWin originally required a minimum Intel 486 CPU and is written in C++.AppleWin has support for most programs that could run either on the Apple II+ or the Apple IIe. By default, AppleWin emulates the Extended Keyboard IIe (better known as the Platinum IIe) with built-in 80-column text support, 128 kilobytes of RAM, two 5¼-inch floppy disk drives, a joystick, a serial card and 65C02 CPU. AppleWin supports lo-res, hi-res, and double hi-res graphics modes and can emulate both color and monochrome Apple II monitors; later versions of AppleWin also can emulate a television set used as a monitor. Both 40-column and 80-column text is supported.AppleWin can emulate the Apple II joystick (using the PC's default controller), paddle controllers (using the computer mouse), and can also emulate the Apple II joystick using the PC keyboard. AppleWin can also use the PC speaker to emulate the Apple II's sound if no sound card is available (does not work under NT-based Windows versions). Full screen mode is available through the use of DirectX. Features added to the latest versions of AppleWin include Ethernet support using Uthernet, Mockingboard and Phasor sound card support, SSI263 speech synthesis, hard drive disk images, save states, and taking screenshots.