Altirra

Windows

Visit site Alternatives

Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Altirra is ranked #8 of 21 in Atari emulators on Freedom251. It runs on Windows. There is a free plan.

Altirra plans and pricing

All plans

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

Best Altirra alternatives

See all 20

Two bars Virtual Jaguar Free tier No. 1Free6.8 Two bars Atari800 Free tier No. 2Free6.6 Two bars BigPEmu Free tier No. 3Free6.6 Two bars Javatari Free tier No. 4Free6.6 Two bars kat5200 Free tier No. 5Free6.6 Two bars Stella Free tier No. 6Free6.5

The record

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

Where it ranks on Freedom251

Best Atari Emulators in 2026#8 of 21

Is Altirra yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote Altirra

Sources

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