JSPspEmu Git (2014/05/08) is released. JSPspEmu is a PSP emulator made using javascript (actually typescript). It will work with any modern browser. Though the first version work only works with Chrome (desktop and android). At this point it can run some demos.

JSPspEmu Git Changelog:
* - WIP sceIoWrite
* - Fixed some functions arity
- Added some more stubs
- Improved sceAtrac3 so it is decoded in a Worker
* - Some more work on sceSasCore
- Function arity checkings
- A couple of arity fixes
- Added workertask
* - Added SceKernelException in order to simplify code, throwing exceptions when errors found + try + catch on createNativeFunction
- Some more work on sceSasCore
- Added initial wip support for screenshots on tests
* - Removed old code from jspspemu.js
- Added missing sprite.pbp
- Fixed underscore reference version
* - small update

Try online: JSPspEmu Git (2014/05/08)
Source: Here