Game Boy TV Tuner (GB/GBC)

The Game Boy TV Tuner was a peripheral for the Game Boy and Game Boy Color. It's made to receive (analog) television signal.

The Game Boy version (1991)
When Sega released the Game Gear in 1990, they released a peripheral to watch TV in the console. Nintendo developed a peripheral for the Game Boy to compete with Sega. It was released in 1991, initially only receiving NTSC-J signal (in the Japanese version) in both VHF and UHF in the monochrome 4 greyscale tones Game Boy palette. It had composite, SCART and coaxial video inputs to receive analog video signal or to show the Game Boy screen content in a TV or a computer monitor.

Game Boy Color (1998)
Shortly after the Game Boy Color was released, Nintendo released an upgraded version of the Game Boy TV Tuner, now with colour support (up to 16 colours at the same time from a 15-bit colour palette).

Game Boy version

 * 160x200 (4:3) with 4 greyscale colours (with letterbox due to the 10:9 160x144 Game Boy resolution)
 * 160x144 (streched from 4:3 to 10:9) with 4 greyscale colours
 * 160x144 (with pan and scan from 192x144) with 4 greyscale colours

Colour modes

 * 160x200 (4:3) with 16 colours from a 15-bit colour palette (with letterbox due to the 10:9 160x144 Game Boy resolution)
 * 160x144 (streched from 4:3 to 10:9) with 16 colours from a 15-bit colour palette
 * 160x144 (with pan and scan from 192x144) with 16 colours from a 15-bit colour palette

Monochrome modes (same as the Game Boy version)

 * 160x200 (4:3) with 4 greyscale colours (with letterbox due to the 10:9 160x144 Game Boy resolution)
 * 160x144 (streched from 4:3 to 10:9) with 4 greyscale colours
 * 160x144 (with pan and scan from 192x144) with 4 greyscale colours