v86

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v86 emulates an x86-compatible CPU and hardware. Machine code is translated to
WebAssembly modules at runtime in order to achieve decent performance. Here's a
list of emulated hardware:

- An x86-compatible CPU. The instruction set is around Pentium 4 level,
  including full SSE3 support. Some features are missing, in particular:
  - Task gates, far calls in protected mode
  - Some 16 bit protected mode features
  - Single stepping (trap flag, debug registers)
  - Some exceptions, especially floating point and SSE
  - Multicore
  - 64-bit extensions
- A floating point unit (FPU). Calculations are done using the Berkeley
  SoftFloat library and therefore should be precise (but slow). Trigonometric
  and log functions are emulated using 64-bit floats and may be less precise.
  Not all FPU exceptions are supported.
- A floppy disk controller (8272A).
- An 8042 Keyboard Controller, PS2. With mouse support.
- An 8254 Programmable Interval Timer (PIT).
- An 8259 Programmable Interrupt Controller (PIC).
- Partial APIC support.
- A CMOS Real Time Clock (RTC).
- A generic VGA card with SVGA support and Bochs VBE Extensions.
- A PCI bus. This one is partly incomplete and not used by every device.
- An IDE disk controller.
  - A built-in ISO 9660 CD-ROM generator with Joliet support.
- An NE2000 (RTL8390) PCI network card.
- Various virtio devices: Filesystem, network and balloon.
- A SoundBlaster 16 sound card.
- A hayes-compatible dial-up Modem.

## Demos

[9front](https://copy.sh/v86/?profile=9front) —
[Arch Linux](https://copy.sh/v86/?profile=archlinux) —
[Android-x86 1.6-r2](https://copy.sh/v86?profile=android) —
[Android-x86 4.4-r2](https://copy.sh/v86?profile=android4) —
[BasicLinux](https://copy.sh/v86/?profile=basiclinux) —
[Buildroot Linux](https://copy.sh/v86/?profile=buildroot) —
[Damn Small Linux](https://copy.sh/v86/?profile=dsl) —
[ELKS](https://copy.sh/v86/?profile=elks) —
[FreeDOS](https://copy.sh/v86/?profile=freedos) —
[FreeBSD](https://copy.sh/v86/?profile=freebsd) —
[FiwixOS](https://copy.sh/v86/?profile=fiwix) —
[Haiku](https://copy.sh/v86/?profile=haiku) —
[SkiffOS](https://copy.sh/v86/?profile=copy/skiffos) —
[ReactOS](https://copy.sh/v86/?profile=reactos) —
[Windows 2000](https://copy.sh/v86/?profile=windows2000) —
[Windows 98](https://copy.sh/v86/?profile=windows98) —
[Windows 95](https://copy.sh/v86/?profile=windows95) —
[Windows 1.01](https://copy.sh/v86/?profile=windows1) —
[MS-DOS 6.22](https://copy.sh/v86/?profile=msdos) —
[OpenBSD](https://copy.sh/v86/?profile=openbsd) —
[Oberon](https://copy.sh/v86/?profile=oberon) —
[KolibriOS](https://copy.sh/v86/?profile=kolibrios) —
[SkiftOS](https://copy.sh/v86?profile=skift) —
[QNX](https://copy.sh/v86/?profile=qnx)

## Documentation

[How it works](docs/how-it-works.md) —
[Networking](docs/networking.md) —
[Dial-up m