You can download driver for Star Micronics TUP900/TSP800/TSP700/TSP600 3.73.0.0 here, but DriversKit`s Team strongly recommend you to use Driver Updater Pro for finding latest version of this driver. You can download Driver Updater Pro here.
Also you can:
Search Star Micronics TUP900/TSP800/TSP700/TSP600 3.73.0.0 driver at Google
Search Star Micronics TUP900/TSP800/TSP700/TSP600 3.73.0.0 driver at Yahoo
Search Star Micronics TUP900/TSP800/TSP700/TSP600 3.73.0.0 driver at MSN
Search Star Micronics TUP900/TSP800/TSP700/TSP600 3.73.0.0 driver at Teoma
Search Star Micronics TUP900/TSP800/TSP700/TSP600 3.73.0.0 driver at AltaVista