Altirra vs Íris Emulator

Altirra is a Windows emulator for 8-bit Atari computers, covering the Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS and 5200. It provides cycle-exact handling of documented hardware and models undocumented behavior, including DMA timing and undocumented 6502 instructions. Supported files include ATR, ATX, ATZ, DCM, XFD, PRO, ARC, BAS, ROM, BIN, A52, CAS and SAP. Reimplemented operating-system, BASIC and handler ROMs are included, while real Atari ROM images can be supplied for compatibility. The emulator models memory and cartridge expansions, PBI devices, modems and 65C02/65C816 accelerators. Disk options include accelerated loading, realistic timing, sounds and drive CPU emulation. Its debugger offers source stepping, breakpoints, watchpoints, history and profiling. Recording, a cheat trainer, disk browsing and text copy/paste are also included. Altirra is free under GPL version 2 for Windows 7 or later.

Íris Emulator is a free, open-source emulator for Atari 2600, Atari Lynx, and Atari Jaguar games on 64-bit Windows 10 or 11. The Atari 2600 core emulates the 6507 CPU and TIA, with NTSC, PAL, and SECAM support and several cartridge mappers. Lynx emulation covers the 65C02, Mikey, and Suzy, with LNX cartridges, HLE boot for homebrew, and optional user-supplied boot ROM support for commercial games. Jaguar support includes .j64 and .jag cartridges, RF Cable and S-Video filters, upscaling to 1080p, and Auto, 4:3, or 16:9 display ratios. The interface offers cover-art browsing, a first-launch wizard, fullscreen mode, remappable keyboard and gamepad controls, and ten save-state slots. VST3 audio processing uses a reorderable chain and master gain. Optional Discord Rich Presence requires the Discord desktop app. ROMs and BIOS files are not included.