JSPspEmu Git (2014/07/22) 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:
* - Enable loading of encrypted EBOOT.BIN files
* - Added reference binaries for testing
* - Updated project
* - Small refactorings
* - Some improvements on decoding
* - More speed improvements on decrypting ~PSP file
* - Small speedup for jsaes
* - Small speedups in decoding prx
* - WIP: Encrypted PRX Decryption (~PSP magic)

Try online: JSPspEmu Git (2014/07/22)
Source: Here