http://bellard.org/jslinux/tech.html

This PC emulator is written in Javascript. The emulated hardware consists in: […]
Show full quote

This PC emulator is written in Javascript. The emulated hardware consists in:

a 32 bit x86 compatible CPU
a 8259 Programmble Interrupt Controller
a 8254 Programmble Interrupt Timer
a 16450 UART.
The code is written in pure Javascript using Typed Arrays which are available in recent browsers. It was tested with Firefox 4 and Google Chrome 11 on Linux, Window and Mac (it does not work with Chrome 12 beta. As far as I know, it is a bug in the browser). In any case, a fast Javascript engine is needed to have good performance.