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A7800

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What A7800 is

A7800 is a free, open-source emulator for the Atari 7800 and a fork of the MAME Atari 7800 driver. It emulates a range of controllers, including Proline and VCS joysticks, lightguns, paddles, driving controllers, keypads, Trak-Balls, Amiga mice, and ST mice. Display options include selectable palettes and enhanced screen options, and BIOS files are optional rather than required. A7800 maintains MAME compatibility and syntax, allowing MAME configuration files and front ends to be reused. Project-listed technical work includes changes to MARIA DMA timing, RIOT emulation, POKEY sound, and SALLY and MARIA performance. The project page labels v5.2 as the latest release and notes corrections to the POKEY poly9 sequence and initial state. That release specifies 64-bit x64 builds for Linux, macOS, and Windows. The project also lists Android support. The maker describes its GitHub organization as a collection of development tools for the Atari 7800 console.

Who it suits

A7800 is for people seeking an Atari 7800 emulator, including users who want to reuse MAME configuration files or front ends. Its listed controller support spans joysticks, lightguns, paddles, and several other input devices.

What it does well

  • Free and open source.
  • BIOS files are optional.
  • Maintains MAME compatibility and syntax.
  • Supports a wide range of listed controller types.
  • Listed for Android, Linux, macOS, and Windows.

What to know first

  • The v5.2 release specifies x64 builds only for Linux, macOS, and Windows.
  • The project is focused on the Atari 7800.

Getting started

  1. Open the A7800 project on GitHub.
  2. Choose a supported platform: Android, Linux, macOS or Windows.
  3. For Linux, macOS or Windows, use the v5.2 64-bit x64 build.
  4. Reuse MAME configuration files or front ends if applicable.
  5. Select a palette or screen option, and configure an emulated controller.

Verdict

A7800 offers Atari 7800 emulation with broad controller support and MAME compatibility. Note that the v5.2 release specifically lists 64-bit x64 builds for desktop Linux, macOS, and Windows.

Questions

Is A7800 free and open source?

Yes. The project source is offered under GNU GPL version 2 or later; source files may specify licenses in their headers.

Which platforms does A7800 support?

The project lists Android, Linux, macOS and Windows. The v5.2 release specifies 64-bit x64 builds for Linux, macOS and Windows.

Does A7800 require BIOS files?

No. BIOS files are optional.

What system does A7800 emulate?

A7800 emulates the Atari 7800 and is a fork of the MAME Atari 7800 driver.

Can I reuse MAME configuration files and front ends?

Yes. A7800 maintains MAME compatibility and syntax to allow their reuse.

Does the license include a warranty?

The license says the program is provided without warranty, to the extent permitted by applicable law.

Facts from A7800's own pages

BIOS
BIOS files are optional and no longer required. · github.com, 8 Oct 2026
Controller support
It supports emulation of Proline and VCS joysticks, lightguns, paddles, driving controllers, keypads, Trak-Balls, Amiga mice, and ST mice. · github.com, 8 Oct 2026
Developer tools
The a7800dev and a7800pdev machine targets display DMA usage per scanline. · github.com, 8 Oct 2026
Display options
It includes selectable palettes and enhanced screen options. · github.com, 4 Oct 2026
Emulation updates
The project says it fixed a bug in RIOT emulation and improved POKEY sound emulation. · github.com, 8 Oct 2026
Graphics and performance
It includes SALLY CPU and MARIA graphics chip performance adjustments, selectable palettes, and enhanced screen options. · github.com, 8 Oct 2026
Intended audience
The maker describes its GitHub organization as a collection of development tools for the Atari 7800 console. · github.com, 4 Oct 2026
Latest release
The page labels v5.2 as the latest release and lists corrections to the POKEY poly9 sequence and initial state. · github.com, 4 Oct 2026
License
The project source is offered under GNU GPL version 2 or later, with source files potentially having licenses specified in their headers. · github.com, 8 Oct 2026
License and pricing
The repository is public and describes A7800 as an emulator; its pages opened here list no purchase price or subscription plans. · github.com, 4 Oct 2026
MAME compatibility
It maintains MAME compatibility and syntax for reuse of MAME configuration files and front-ends. · github.com, 8 Oct 2026
Purpose
A7800 is an Atari 7800 emulator and a fork of the MAME Atari 7800 driver. · github.com, 4 Oct 2026
Release platforms
The v5.2 release states that 64-bit x64 builds are available for Linux, macOS, and Windows. · github.com, 4 Oct 2026
Timing
Maria DMA timing has been improved with accurate DMA hole penalties. · github.com, 8 Oct 2026
Timing and hardware
The project lists improved MARIA DMA timing, a RIOT emulation fix, POKEY sound improvements, and SALLY and MARIA performance adjustments. · github.com, 4 Oct 2026
Warranty
The license states that the program is provided without warranty, to the extent permitted by applicable law. · github.com, 8 Oct 2026
What it does
A7800 is an Atari 7800 emulator and a fork of the MAME Atari 7800 driver. · github.com, 8 Oct 2026

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