Altirra v4.0 Test 20 is released. Altirra is an Atari 8 bit Emulator on the Windows/DOS platform. Altirra emulates several models of the 8-bit Atari computers. This includes the the 800, 800XL, and 130XE versions. It has a lot of options, and compatibility is decent especially given the emulator's early stages. It also supports some copy protected games properly in emulation.
http://virtualdub.org/altirra.html
http://www.emucr.com/2020/11/altirra-v400-test-20.html
