Altirra 2.1 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.

Altirra 2.1 Test 20 Changelog:

And, now that 2.00 is released, I can release the changes that I've been keeping on the side into the main devline. New features include disk drive emulation levels, Slight-SID emulation, the debugger's alias support has been beefed up to emulate more Atari800 debugger commands, and WIP on 1030 modem support.

Download: Altirra 2.1 Test 20
Source: Here