"8086tiny is a free, open source PC XT-compatible emulator/virtual machine written in C. It is, we believe, the smallest of its kind (the fully- commented source is under 25K). Despite its size, 8086tiny provides a highly accurate 8086 CPU emulation, together with support for PC peripherals including XT-style keyboard, floppy/hard disk, clock, and Hercules graphics. 8086tiny is powerful enough to run software like AutoCAD, Windows 3.0, and legacy PC games.
8086tiny is highly portable and runs on practically any little endian machine, from simple 32-bit MCUs upwards. 8086tiny has successfully been deployed on 32-bit/64-bit Intel machines (Windows, Mac OS X and Linux), Nexus 4/ARM (Android), iPad 3 and iPhone 5S (iOS), and Raspberry Pi (Linux)."