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Tech riderRev. 3 Oct 2026

Altirra

Ch 106.7of 21 Atari Emulators
  1. 1Runs onWindows
  2. 2CostsFree plan
  3. 3Atari systemsAtari 400/800, 1200XL, 600/800XL, 130XE, XEGS, 5200
  4. 4Supported platformsWindows
  5. 5Save statesYes
  6. 6Controller remappingYes
  7. 7BIOS requiredNo
7 lines stated Written from the maker's own pages: virtualdub.org
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The Altirra homepage

Overview

Altirra is ranked #10 of 21 in Atari emulators on Specifiction. 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
Yesvirtualdub.org
Atari systems
Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, 5200virtualdub.org
Supported platforms
Windowsvirtualdub.org
Save states
Yesvirtualdub.org
Controller remapping
Yesvirtualdub.org
BIOS required
Novirtualdub.org

Facts

What it does
Altirra is an emulator for 8-bit Atari computers.virtualdub.org · 3 Oct 2026
Emulated systems
It emulates the Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, and 5200 systems.virtualdub.org · 3 Oct 2026
Accuracy
It provides cycle-exact emulation of documented hardware features and emulates undocumented behavior such as precise DMA timing and undocumented 6502 instructions.virtualdub.org · 3 Oct 2026
File formats
Supported image and software formats include ATR, ATX, ATZ, DCM, XFD, PRO, ARC, BAS, ROM, BIN, A52, CAS, and SAP.virtualdub.org · 3 Oct 2026
ROMs
Altirra includes reimplemented OS, BASIC, and handler ROMs, while real Atari ROM images can be used for greater compatibility.virtualdub.org · 3 Oct 2026
Expansion emulation
It emulates hardware expansions including memory and cartridge expansions, PBI devices, modems, and 65C02/65C816 accelerators.virtualdub.org · 3 Oct 2026
Disk drives
Disk-drive options include accelerated loading, realistic disk timing, drive sounds, and full drive CPU emulation.virtualdub.org · 3 Oct 2026
Debugger
The debugger includes source-level stepping, conditional breakpoints and tracepoints, watchpoints, execution history, and profiling.virtualdub.org · 3 Oct 2026
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.virtualdub.org · 3 Oct 2026
Download architectures
The site offers x86/x64 and ARM64 binaries; the ARM64 build is for Windows 10 on ARM on Snapdragon 835 or higher.virtualdub.org · 3 Oct 2026
System requirements
The listed operating systems are Windows 7, 8, 8.1, 10, 11 or later; Windows RT is not supported.virtualdub.org · 3 Oct 2026
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.virtualdub.org · 3 Oct 2026
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.virtualdub.org · 3 Oct 2026

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Where it ranks on Specifiction

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Sources