3.8. URB SWIs

USBLib_AllocURB (SWI &5636D) - Creates a URB
USBLib_FreeURB (SWI &5636E) - frees a URB
USBLib_URBInfo (SWI &56360) - Gets parameters from a URB
USBLib_SetURB (SWI &56361) - Sets values in a URB