Altirra 1.9 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. 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 Version 1.9 test 21 [changelog 08.03.2011] Serial: XIO commands to R: instead of R1-R4: now work properly. Altirra Version 1.9 prerelease: test 20 [changelog 28.02.2011] That was due to some work in progress for trying to add emulation support for a particular bug. It wasn't finished, but it ended up getting pushed out since I made some test releases for the serial port stuff for someone. I've reverted it and this versions should be OK. I haven't done a lot of work on Altirra otherwise, since most of it has been the serial stuff and I hadn't made much progress on trying to emulate the HSCROL bug. Altirra Version 1.9 prerelease: test 19/18 [changelog 22.02.2011] bugs fixed Printer: Fixed close command not actually closing IOCB. Altirra Version 1.9 prerelease: test 17 [changelog 13.02.2011] features added Serial: Added IPv6 support. Serial: Added option to force specific connection and DTE communication rates. Cartridge: 2K and 4K cartridges are now supported (as mirrored 8K cartridges).

Download: Altirra 1.9 Test 21
Source: Here