I/O
I/O (input/output) refers to how a computer communicates with the outside world. In the Game Boy/Color's Z80-based processor, registers for the input/output range between 0xFF00 to 0xFF70.
The Game Boy/Color has included a huge amount of communication peripherals. One of the most commonly used is the Link Cable; which inspired the Pokémon concept and Satoshi Tajiri's fascination of catching insects. Additionally, the Game Boy Color (but not the Game Boy Advance) included a built-in infrared port.
The Japanese version of Pokémon Crystal communicated over the Internet using a mobile phone and the Mobile GB Adapter, but the Mobile GB Adapter fell into relative obscurity and never left Japan.
DMG mode
- $FF00 - Joypad
- $FF01 - Serial transfer
- $FF04 $FF07 - Timer/divider
- $FF10 $FF26 - Audio
- $FF30 $FF3F - Wave pattern
- $FF40 $FF4B - LCD Control, Status, Position, Scrolling, Palettes
- $FF50 - Is boot ROM disabled? (non-zero if true)
CGB mode
- $FF4F - VRAM Bank Select
- $FF51 $FF55 - VRAM DMA
- $FF68 $FF69 - BG/OBJ Palettes
- $FF70 - WRAM Bank Select
External links
This article or section is a stub. You can help Glitch City Wiki by expanding it. 
|