Which Nintendo DS port does the Guitar Grip plug into?

Which Nintendo DS port does the Guitar Grip plug into? The Game Boy Advance port.

The Guitar Hero: On Tour Guitar Grip plugs into the Nintendo DS’s backward-compatible Game Boy Advance Game Pak slot. The attachment uses that connection to provide the game’s fret buttons while the player strums across the DS touchscreen with a guitar-pick-shaped stylus.

This design works with the original Nintendo DS and the DS Lite, although the Grip includes a removable adapter to fit both models. It cannot be used with the Nintendo DSi, DSi XL, or Nintendo 3DS family because those systems lack the Game Boy Advance slot.

The port is sometimes mistaken for the DS card slot because the game cartridge still occupies the system’s normal DS game-card position. It is also not a headphone or link-cable connection: the GBA slot is the distinctive hardware feature that made the portable Guitar Hero concept possible.