A ribbon protector is attached to a ribbon cartridge to prevent an ink ribbon from being soiled. Additional information, such as the direction from an internal hypertext link definition to the location in the document pointed to by that definition, andor the absolute or relative position of the location pointed to by an internal hypertext link definition, may also be displayed. The method is employed to process input data provided by the microcontroller during a memory write operation, or input data extracted from the memory during a memory read operation, respectively. Since no screws are necessary for the assembling of the backboard structure, no laborious work is required as well. This carriage servo apparatus further comprises a microcomputer for detecting a minimum value of a motor drive signal required for moving the carriage from its still state, and setting a motor drive signal when recording or reproducing information, based on the detected minimum value.