an electronic apparatus includes a program memory having a parallel transfer program and a serial transfer program , a connector on the electronic apparatus to which a parallel transfer interface or a serial transfer interface is detachably connected , and a judging unit for judging the kind of the printer interface connected to the connector . a program suitable for the kind of the printer interface judged by the judge unit is called from the program memory by means of a program selecting unit . this enables the electronic apparatus to be connected for use with a parallel transfer printer and a serial transfer printer .