Atari 7800 Emulator

Before you play

This page uses EmulatorJS with the configured prosystem core. You need your own lawfully obtained game dump; this site does not supply commercial ROMs or BIOS files.

Use an Atari 7800 dump on this page. Header information in an A78 file can describe cartridge requirements.

This app does not require a BIOS selection to enable Start. That is an interface rule, not a guarantee that every game or media type is free of firmware requirements.

The emulator runtime must load before a game can start. Your selected game files are used locally, not uploaded to a game server.

Accepted files

This page accepts: .a78, .bin, .rom. These are importer extensions, not a tested game compatibility list.

Select a game file in one of the listed formats. A generic BIN or ROM extension does not identify the correct system.

ZIP containers can be extracted locally by the importer. Keep all required game files together; extraction does not convert a dump into another system or format.

Controller setup

Atari 7800 games commonly use a joystick and two action buttons. Console controls may also be needed to start a game.

Use the player input settings to inspect or change bindings. Focus the game before using the keyboard, and connect a gamepad before checking its inputs. Browser recognition does not guarantee every controller or accessory works.

Known limits

An Atari 2600 game should use the separate 2600 page; shared cartridge-family history does not make all dumps interchangeable.

Performance and accuracy depend on the game, core, device and browser. No per-game compatibility or full-speed guarantee is made.

The local library may need you to re-link files when browser storage is unavailable or cleared. Keep original dumps and independent backups of important progress.

If a game does not start

For boot problems, verify the cartridge dump and any A78 header information; for input problems, check both action buttons.

Check the player error message, the selected system and the original dump first. A successful extension check does not validate the file contents. See Guides for the import workflow and the core reference below for system requirements.