Z64K Beta (2018/09/12) 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:
Removed experimental HPOS,HSIZE,VPOS,and VSIZE sliders and replaced with widget under screen tab of display settings. Box that reflects the screen dimensions can be resized and repositioned using the mouse. Still only works properly with VDC. Will add support for other video chips soon.
Temporarily removed unreliable video information in console window. I'm working on a new rendering system which will provide a lot more accurate information, especially for VDC.
Set language menu item to correct value on start up.
Include 'io' command in machine monitor. At the moment it only supports VICII. It will be similar functionality as VICE.
io [

]
e.g. io d000 dumps the VICII registers

Download: Z64 Beta (2018/09/12)
Source:Here