Altirra 2.5 Test 21 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. Altirra is quite matured now, and IMO, the best Atari Emu currently! It also supports some copy protected games properly in emulation.

Altirra 2.5 Test 21 Changelog:

Added SSF39SF040 as an option for U1MB... already had the code for it, so the UI changes took more time than anything else. Note that you´ll need to reinit U1MB for the changes to take effect. Also fixed absolute long mode disassembly, added 17MHz and 21MHz options for ´816 mode, and added another hook path so the H: device inits on 65C816 XL OS.

Download: Altirra 2.5 Test 21
Source: Here