Altirra 1.9 Test 17 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.

Mostly serial stuff and some obscure PRIOR timing changes, but this version can now mount 2K and 4K cartridges as mirrored 8K.

Download: Altirra 1.9 Test 17
Source: Here