Altirra 1.9 Test 12 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 1.9 Test 12 Changelog:
Turns out the double density disks are MyDOS format, which are subtly different from DOS 2.0/2.5... I\'ve hacked in enough support into the Disk Explorer to open them read-only. This version also has emulation accuracy updates for CPU bugs and interrupt accuracy tweaks. It now emulates the 6502 BRK bug, and also the blocked NMI bug when enabled in CPU options, which means that it now passes all Acid800 tests. I plan to attack the ANTIC HSCROL bug next.

Download: Altirra 1.9 Test 12
Source: Here