Altirra 2.1 Test 4 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 3 Changelog:

This version adds Covox support and also fixes a bug that was causing noise in high pass filtering (affected Nemesis demo). I did also do some heavy reorganization on the CPU hooking code, so watch out for SIO/CIO patch breakage. I'll have to look into the DOS XE issue. It may be another problem with PERCOM block support (grr).

Download: Altirra 2.1 Test 4
Source: Here