Why is There a Circuit Board in the DS Lite GBA Slot Cover?

NDS ROMs DOWNLOAD FREE ds lite gameboy slot From Nintendo, the DS Lite has brighter screens and weighs less than the previous model but ds lite gba slot Hard wiring a SNES controller to DS Lite via GBA Slot

dsi gameboy slot Has anyone on this forum made a snes controller that plugs into the gba slot via the gba slot dust cover? I saw a mod on an other forum