Z64K (2019/06/01) is released. Pixel exact emulation of the Commodore 64, VIC 20 and Atari 2600 written entirely in Java. The emulators should run on any platform with an updated java runtime environment installed.

Z64K Changelog:
1 June
Create custom sample rate for Atari 2600 to exactlymatch TIA sample rate. Removes high pitch sound from Quadrun.
Updated Cosmic Ark and Bang! starfield effect to output single/double or no pixel depending on internal TIA clock cycles.
Updated quick guide to include Atari 2600 Keyboard options for changing switches.

Download: Z64 (2019/06/01)
Source:Here