Gravis Firebird Joystick *Vintage Mac ADB!*Gravis Part Number 2011-113 Button ADB (Apple Desktop Bus) Joystick for older Macs.Features 13 Programmable Buttons, 8 Way View Switch, T-Grip Throttle & Elevator Trim ControlRequires an ADB Port (The little round port, same as your old keyboard/Mouse).It is NOT USB and NOT OSX CompatibleRequires MacOS 7 or Better,Will NOT work on the Mac 512/XL/Plus/SE or Classic.