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Linux kernel runs inside web browser
The emulated hardware includes a 32-bit x86 compatible CPU, a 8259 programmable interrupt controller, a 8254 programmable interrupt timer, and a 16450 UART (universal asynchronous receiver/transmitter). According to Bellard, the emulated CPU is comparable to an Intel 486 chip, though it does not include a floating point unit. Bellard was able to emulate a floating point unit, however, using the Linux kernel.
Bellard believes his emulator could be used for client-side cryptographic processing. Or – if you're looking for a more serious pursuit – he also points out it could eventually let you play old DOS games. ®