jupiler is a Jupiter Ace emulator written in javascript. It was originally designed for another project, BasColAce, a firmware for Jupiter Ace with the ZX Basic interpreter. It's emulated the original machine (3K) with a 48K RAM expansion, sound, Boldfield Joystick, .TAP and .ACE files supported.

jupiler has a GPL license, the source code is here. It shares the same Z80 engine as jbacteria, Roland and jtandy, but the rest is developed from scratch. All the Jupiter Ace software is extracted from this fantastic web http://jupiter-ace.co.uk.

Instructions:

my email is anyone at antoniovillena.es