ZSNES is an emulator of the Super Famicom and SNES video game systems.
ZSNES is largely written in Intel x86 assembly language, and is therefore not easily portable to other architectures, such as PowerPC. Due to being written in assembly, ZSNES is very fast, allowing it to run most SNES games at 60 frames per second on a computer with a Pentium II CPU and 64 MB RAM, with full stereo sound and basic graphics interpolation.
ZSNES was originally DOS-based, but has since been ported to other systems, including Windows, Linux, FreeBSD, Mac OS X (Intel only) and the Xbox. Since 2001, ZSNES has been free software under the terms of the GNU General Public License (GPL).