Z64K Beta (2016/04/20) 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 Beta (2016/04/21) Changelog:
* Fixed REU menu
* Fixed Expert Cartridge support.
* Sprites enabled in at sprite xpos values of 0x1f8-0x1ff in NTSC mode
* Frames/second status reflects the number of emulated frames instead of frames drawn (warp mode)
* MOS6567R56A (OLD NTSC) available via Machine settings. I will clean up the GUI in the next release.

Download: Z64K Beta (2016/04/21)
Source:Here