Official repository for 8086tiny: a tiny PC emulator/virtual machine
Assembly C CSS Shell
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adriancable Revision 1.25
Major CPU, graphics, text and audio performance improvements. Support
for DOS Plus and CPM-86. BIOS bug fixes.
Latest commit c79ca2a Mar 19, 2014
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bios_source Revision 1.25 Mar 19, 2014
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8086tiny.c Revision 1.25 Mar 19, 2014
Makefile Revision 1.25 Mar 19, 2014 Revision 1.20 Feb 20, 2014
bios Revision 1.25 Mar 19, 2014
fd.img Revision 1.20 Feb 20, 2014
license.txt Revision 1.01 Jan 30, 2014
runme Revision 1.00 Jan 30, 2014


8086tiny is a completely free (MIT License) 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, audio, and Hercules/CGA graphics. 8086tiny is powerful enough to run software like AutoCAD, Windows 3.0, and legacy PC games: the 8086tiny distribution includes Alley Cat, the author's favorite PC game of all time.

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).

The philosophy of 8086tiny is to keep the code base as small as possible, and through the open source license encourage individual developers to tune and extend it as per their specific requirements, adding support, for example, for more complex instruction sets (e.g. Pentium) or peripherals (e.g. mouse). Forking this repository is highly encouraged!

Any questions, comments or suggestions are very welcome in our forum at