ADB keyboard handle id ====================== 0x01 Apple Standard keyboard M0116 ANSI 0x01 Apple Desktop Bus keyboard 658-4081 ANSI 0x02 Apple Extended Keyboard M0115 ANSI 0x02 Apple Extended Keyboard II M3501 ANSI 0x03 Logical id for Extended Protocol 0x10 Apple Adjustable keyboard M1242 ANSI Adjustable Keyboard media key ============================= Media key part has different address than the main keyboard(0x02). Device Address: 0x07(Appliances/Misc devices) Handler ID: 0x02 Scan Codes ---------- Media key ADB Code Code in Matix ----------------------------------------- Volume Up: 0x03 0x48 Volume Down: 0x02 0x49 Mute: 0x01 0x4a Mic: 0x00 0x42 As for these keys raw ADB codes are translate into logical codes in matrix.