Z64K (2019/06/08) 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:
8 June
Add Atari 2600 DPC+ cartridge support
7 June
Slightly adjust Atari 2600 crystal clock speed to be 3.579575 MHz
Added Atari 2600 Spectravideo Compumate support
6 June
Fixed graphics in first and last pixel column in Pitfall II
Atari 2600 Pitfall II support.

Download: Z64 (2019/06/08)
Source:Here