Altirra 2.1 Test 2 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 2 Changelog:

features added SlightSID emulation support. Disk: Added support for format skewed ($66) command. Disk: Format commands ($21, $22) now support high-speed operation. Disk: Added emulation profile modes for various disk drives. Disk: Reduced ACK-to-complete delay when accurate sector timing is off. Debugger: Added .sum (sum memory area) command. Debugger: Added .warmstart command. Debugger: Added ap (alias pattern) command for adding aliases with patterns. Debugger: Added additional aliases to a8 command (set Atari800-compatible command aliases). Debugger: Added alternate L>addr syntax for setting an address range length based on an end address. Serial: 1030 Modem support.

Download: Altirra 2.1 Test 2
Source: Here