GB/GBC compatibility

Game Boy and Game Boy Color Compatibility

One of the GBA's quiet strengths is backward compatibility. The system plays original Game Boy and Game Boy Color cartridges in addition to its own GBA games, so a single handheld covers three generations of the line.

This works because the GBA includes the older Sharp processor used by classic Game Boy hardware. When you insert a GB or GBC cartridge, the console switches the CPU into a compatibility mode and behaves, for that game, like a Game Boy Color. The GBA's own ARM7 chip steps aside.

What you notice

• Aspect ratio. Classic games used a squarer screen, so the GBA can letterbox or stretch them; some models let you toggle the fit with the shoulder buttons at boot.
• Color. Original monochrome Game Boy games are given a palette automatically, much as they were on the Game Boy Color.
• Sound. Audio routes through the classic sound channels for an authentic result.

Note that the GBA, GBA SP, and Game Boy Micro differ here: the Micro dropped backward compatibility entirely, while the original GBA and most SP units retain it. If classic cartridge support matters to you, check the specific model before buying.