Z64K (2021/09/12) 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:
Setting of Z80 registers using machine monitor is now functional
Setting of Z80/6502 registers with machine monitoruses current radix

Download: Z64 (2021/09/12)
Source:Here