Altirra v2.4 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 v2.4 Changelog:

[features added] 65C816: Optimized mode switches. Audio: Added drive sound volume level option. Cartridge: Added support for .CAR types 53-59 (2K, 4K, right-as-left 8K, right slot 4K, 128-512K SIC!). CPU: Preliminary support for accelerated 65C816 operation. Debugger: Added .dmabuf command. Debugger: Added %e, %f, and %g formats to .printf command. Debugger: Verifier can now detect 64K address space index wrapping and abnormal DMA conditions. Debugger: Added fbx (fill bytes with expression) command. Debugger: r (register) command now allows access to 65C816 registers. Disk: Added "Extract Boot Sectors" command to disk dialog for use with bootable virtual disks. LLE: Added PBI device interrupt support. MMU: High (65C816) memory can now be adjusted from 0KB-4032KB. Profiler: Added 65C816 support. Recorder: Added .WAV file audio recording. Recorder: Added option for encoding duplicate frames as full frames. UI: Added on-screen indicators for console buttons held on startup. UI: Added on-screen indication for some view mode changes. UI: Added support for per-monitor DPI scaling in Windows 8.1. UI: Added custom debug font dialog for half point sizes. UI: File > Exit now confirms if there are modified images. XEP80: Initial support. [bugs fixed] 5200: Floating data bus is now enabled in 5200 mode. 65C816: Fixed cycle timing for JMP (abs) instruction. 65C816: Fixed cycle timing for TXY instruction. 65C816: Fixed TYX instruction. 65C816: INX was checking M bit instead of X bit. 65C816: Read/modify/write instructions now do read/write/write in emulation mode. 65C816: Fixed (dp), (dp,X), and (dp,Y) behavior with DP!=0. ANTIC: Disabling playfield DMA after playfield start now reads bus data into the line buffer. ANTIC: Abnormal playfield DMA is now emulated. ANTIC: Improved precision of CHACTL changes. Cartridge: Fixed $BFxx reading with 5200 64K cartridge type. CPU: Illegal instruction option now saves correctly. Debugger: Display float (df) command displays all ten significant digits. Debugger: Fixed LLE kernel ROM auto-reload and symbol load option. Debugger: UI panels are now more consistent with debugger commands in numeric base handling. Debugger: Fixed incorrect disassembly on step when running from high banks. GTIA: Fixed bug with VDELAY on missiles. GTIA: Fixed regression with hires player-playfield collisions (since 2.30). LLE: Fixes and optimizations to math pack. LLE: Decimal flag is now cleared before dispatching IRQs. LLE: Fixed BRK handler to handle stack wrapping. LLE: 5200 BIOS now strobes NMIRES for DLIs. LLE: Fixed CIOINV timing so that emulated CIO hooks work. LLE: Corrected K: debounce logic and E: AUX2 open handling (fixes Action! with LLE firmware). HLE: Fixes to math pack acceleration. HLE: Added partial fix for CDTMA1 during accelerated disk reads (fixes Ankh with SIO patch enabled). IDE: Fixed value of Sector Count register after READ SECTOR and WRITE SECTOR commands. MMU: Fixed aliasing of high memory banks. POKEY: SKSTAT bit 1 is now emulated. Printer: Emulated P: device now supports the PUT CHARS command with len=0. Serial: Emulated R: device supports break interrupts. UI: Fixed GDI handle leak in text editor. UI: Added workaround for set file associations dialog not appearing on Windows 8. UI: Fixed ANTIC DMA visualization mode with extended PAL height. UI: Fixed PCLink indicator not updating. U1MB: Fixed PIA read decoding to only respond to $D300-D37F (unfixes Bounty Bob Strikes Back!).

Download: Altirra v2.4
Source: Here