CPCBox Beta v20110627 is released. CPCBox is a CPC emulator which runs in the browser as a HTML5/JavaScript application.

CPCBox Beta v20110627 Changelog:
- Revision of the emulation of the AY. Discovery and correction of major problems in the engine AY. The emulator is as close as possible to the actual behavior of the AY.
- Fixed mixing formula Noise / Tone, which was bad.
- Fixed a problem at the insidious period of the tone.
- Fixed the period of the ADSR envelope.
- Fixed behavior CRTC1 with registers R12/R13. It gives a big improvement in some demos (eg Chany).
- Interruptions were issued a microseconds too soon. Correction of this timing issue. The demo "The Other World" works well now.
- Fixed support for ZIP files and the eject button no longer works in the previous version.



Source: Here