the efficiency and speed in ink jet printing can be improved by adding a storage register between the shift register and the jet drive logic . by adding the storage register , jet print data that is serially loaded into the shift register can be parallel transferred to the storage register , where it is used by the jet drive logic to fire ink jets . while the jets are being fired new data is loaded and transferred to the storage registers to be used by the jet drive logic . this improves the system efficiency by eliminating the need for two extra pulses that are usually needed to load the first block of data and fire the last block of data .