Altirra 2.3 Test 9 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 2.3 Test 9 Changelog:
* Cartridge: SIC! cartridges can now be switched between Am29F040B and SST39SF040 flash chip emulation in Options.
* Disk: Folders can now be mounted as virtual disk images using the SpartaDOS file system.
* Display: Normal overscan mode now only shows 224 scanlines in NTSC mode instead of 240.
* Display: Altered full screen resolution selection to allow possibly unsupported modes for better access to 50Hz refresh modes.
* Display: Fixed alignment errors in OS Screen Only mode with extended PAL height enabled.
* Display: Enabled frame skip and reduced latency in full screen vsync mode.
* GTIA: Player/missile size code %%10 can now trigger shifter lockup.
* GTIA: Improved accuracy of mid-shift size changes.
* Display: Fixed alignment errors in OS Screen Only mode with extended PAL height enabled.
* Display: Enabled frame skip and reduced latency in full screen vsync mode.
* GTIA: Player/missile size code %%10 can now trigger shifter lockup.
* GTIA: Improved accuracy of mid-shift size changes./a>

Download: Altirra 2.3 Test 9
Source: Here