Abstract: A structure for mutually exclusive use of connectors includes plural connectors. The plural connectors are disposed adjacent to each other on an outer surface of a housing of an electronic device. Each of the plural connectors has a connecting portion connectable to an external device. The plural connectors are located on radial lines starting from a predetermined point and the connecting portion of each of the plural connectors faces the predetermined point, so that an external device is connectable only to a selected one of the plural connectors.

Abstract: In one embodiment, a predetermined amount of bitmap data is accumulated in a first cache memory, a predetermined amount of arrangement-converted bitmap data is accumulated in the second cache memory, the number of instances of switching between value 0 and value 1 when transferring/outputting bitmap data is compared to the number of instances of switching between value 0 and value 1 when transferring/outputting arrangement-converted bitmap data, and the bitmap data or the arrangement-converted bitmap data with the lesser number of instances of switching is transferred/output to a RAM; thus, the power consumption when transferring/outputting data to the RAM via a data bus is reduced.