9 MOBILE COMPUTER DATA TERMINALS AND RELATED HARDWARE PACKAGES SOLD AS A UNIT COMPRISING TERMINALS, BASE STATION CONTROLLERS, KEYBOARD LAYOUTS, DISPLAY SCREEN FILTERS, FREQUENCY AND CHANNEL SELECTORS, POWER SUPPLY AND VOLTAGE REGULATOR CHANGERS AND CUSTOMIZED CABLING, AND COMPUTER MEMORY OR PROGRAM CHIPS MODIFIED TO PROVIDE SELECTIVE CALLING AND EQUIPMENT TO PROVIDE LINKAGE BETWEEN THE MOBILE TERMINALS AND THE BASE COMPUTER BY MEANS OF WIRE, FM RADIO OR MICROWAVE, NAMELY - COMMUNICATIONS CONTROLLERS; OPERATIONS CONTROLLERS, BASE STATION CONTROLLERS, MULTI-CHANNEL PROCESSORS; LANDLINE MODEMS; BASE STATION RADIOS; AND BASE SITE MONITORS