On the original Game Boy (DMG) or the color version (CGB) is the Serial Data pin ever used by a retail game?
It is a middle pin on the link port.
game-boy
On the original Game Boy (DMG) or the color version (CGB) is the Serial Data pin ever used by a retail game?
It is a middle pin on the link port.
Best Answer
The Game Link Cable
The most obvious candidate for this are games that use the Game Link Cable. Individually checking all of them would be an imposing task, but luckily we don't have to. A schematic drawing of the wiring of the 8-bit Game Link Cable shows us this:
There is no wiring for the SD pin. From this we can conclude that no games using the standard Game Link Cable will make use of this pin. This also rules out the Gameboy Printer and the four player connector as both connect using a standard cable.
Other Candidates
This leaves us with more specialised hardware that connects using the Game Link port but does not use the Game Link Cable. Apart from the unreleased Work Boy there are only two options:
Game Boy Mobile Phone connector
Released in Japan only for use with some Pokémon games.
Singer Izek 1500
An Game Boy-enabled embroidering machine. It has a built-in custom link cable and a custom game cartridge. The Game Boy is used to select different patterns and options.
Sadly I don't have access to either piece of hardware and thus can't tell what pins they use.