Altirra

Altirra is ranked #8 of 21 in Atari emulators on The Geeks Club. It runs on Windows. There is a free plan.

Altirra plans and pricing

Altirra Free GNU General Public License (GPL), version 2 · Windows 7 or later · x86/x64 or ARM64 virtualdub.org · 3 Oct 2026

Compared on Atari emulators

Free plan: Yes
Atari systems: Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, 5200
Supported platforms: Windows
Save states: Yes
Controller remapping: Yes
BIOS required: No

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Altirra

What it does: Altirra is an emulator for 8-bit Atari computers.
Emulated systems: It emulates the Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, and 5200 systems.
Accuracy: It provides cycle-exact emulation of documented hardware features and emulates undocumented behavior such as precise DMA timing and undocumented 6502 instructions.
File formats: Supported image and software formats include ATR, ATX, ATZ, DCM, XFD, PRO, ARC, BAS, ROM, BIN, A52, CAS, and SAP.
ROMs: Altirra includes reimplemented OS, BASIC, and handler ROMs, while real Atari ROM images can be used for greater compatibility.
Expansion emulation: It emulates hardware expansions including memory and cartridge expansions, PBI devices, modems, and 65C02/65C816 accelerators.
Disk drives: Disk-drive options include accelerated loading, realistic disk timing, drive sounds, and full drive CPU emulation.
Debugger: The debugger includes source-level stepping, conditional breakpoints and tracepoints, watchpoints, execution history, and profiling.
Recording and utilities: Features include audio and video recording, a cheat trainer, a DOS disk explorer with drag-and-drop, and text mode copy/paste.
Download architectures: The site offers x86/x64 and ARM64 binaries; the ARM64 build is for Windows 10 on ARM on Snapdragon 835 or higher.
System requirements: The listed operating systems are Windows 7, 8, 8.1, 10, 11 or later; Windows RT is not supported.
Notable limitation: The author says Altirra is designed as a system emulator and debugger, and that setup is involved; users need their own Atari software.
License and affiliation: Altirra is licensed under GPL version 2, and the author states that neither the author nor the software is affiliated with Atari.
Price from: Free

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Where it ranks on The Geeks Club

Best Atari Emulators in 2026#8 of 21

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Sources

virtualdub.org/altirra.html· checked 3 Oct 2026