GameBoy Online is a Game Boy and GameBoy Color emulator written in Javascript. It strives to be efficient and try to have a perfect compatibility. Currently the execution speed is not optimal even on browsers. For example on Chrome, which is nevertheless deemed to run Javascript faster on a PC running Windows 7 64-bit version with a double heart 2 CPUs at 2.2 GHz, games run at normal speed but almost skipping some frames.

The sound production is still experimental and rather poor quality. The video portion is by HTML5 or by creating images with BMP string URI. State backups are implemented using the object window.localStorage and are serialized / deserialized JSON. Ditto for backup SRAM.



GameBoy Online Changelog:
- Optimizing edge tiles rendering.
- Optimizing window rendering.
- Fixed up a window rendering edge case.
- pAPU emulation update.
- Found and fixed a crasher that could lock up some browsers. Involved the channel 1 frequency sweep going past a certain condition that for some reason I failed to guard against correctly.

Play Online: GameBoy Online (2011/09/12)
Source: Here