emulate its CPU by interpretation, the environment it emulates is completely independent of the host CPU. On systems which provide the x86, ARM, or other RISC instruction sets, however, DOSBox can use dynamic instruction translation to accelerate execution. The emulated CPU speed of DOSBox is also manually adjustable by the user to accommodate the speed of the systems for which DOS programs were originally written. DOSBox uses the Simple DirectMedia Layer external library to handle graphics, audio, and input devices. Graphically, it can use the DirectDraw or OpenGL APIs, and can also use bilinear interpolation and scale graphics for computers with modern displays. Graphical emulation includes text mode, Hercules, CGA, EGA, VGA, VESA, S3 Trio 64, and Tandy. Sound emulation includes the PC speaker, AdLib, Gravis Ultrasound, Sound Blaster, Disney Sound Source, Tandy, and MPU-401. However, because DOSBox does not come packaged with Gravis Ultrasound drivers, they need to be installed separately for full support. DOSBox can simulate serial null modems using the TCP/IP protocol and IPX network tunneling, which allows for DOS multiplayer games using one of them to be played over local area networks or the Internet. It can also simulate the PC joystick port, with limited options being to emulate one joystick with four axes and four buttons; one gamepad with two axes and six buttons; two joysticks each with two axes and two buttons; a Thrustmaster Flight Control System joystick that has three axes, four buttons, and a hat switch; and a CH Flightstick with four axes, six buttons that can be pressed only one at a time, and a hat switch. Newer joysticks and gamepads will need to use one of these configurations to function. Reception DOSBox has become the de facto standard for running DOS games. Rock, Paper, Shotgun positively remarked on the project's continual reception of updates, its influence on PC gaming, and some front ends designed to facilitate using it. Freelance writer Michael Reed lauded the quality of scaled graphics and the project's overall focus on compatibility and accurate emulation, but criticized the lack of both save states and user-friendly control over the emulator during runtime, even with the front ends available at the time of his review. DOSBox was named SourceForge's Project of the Month in May 2009 and again in January 2013, making it the first project in the website's history to receive two Project of the Month awards. On