Printing apparatus

A printing device (2) for printing an image receiving medium has a printing mechanism and a keyboard (4) having a plurality of data entry keys (6) for entering data for controlling the printing mechanism and a user key (16). Storage means for holding data accessible in response to the data entered at the keyboard (4) is provided. A controller defines an image to be printed on an image receiving medium in dependence on the data accessed in response to the data entered at the keyboard (4) so that the controller operates selectively in one of a plurality of modes of operation. The modes of operation include a normal mode of operation in which at least some of the keys (6) have predetermined functions associated therewith to access predetermined data associated with the predetermined functions. There is also a user determination mode which is entered by activation of the user key (16) in which the user is able to define a user function associated with one or more of the data keys (6) so that the user defined data is held in the storage means to implement the user function. There is also a user defined mode in which the data entry keys (6) are operable to define a label to be printed in accordance with the user defined data.