Abstract: Instruction memories and a data memory are connected to a bus master which inputs or outputs an address signal and a data signal. The instruction memories are interleaved and are driven by a predicted address. The predicted address is retained upon accessing the data memory. As long as instruction codes are consecutive and addresses are not changed intentionally, effects of the interleaved arrangement can be shown even where a data area exists in the instruction codes.

Abstract: In a printing apparatus for printing on printing paper, page by page, wherein print data of each of virtual pages are divided into blocks, print data of effective blocks are stored in an image memory, while print data of empty blocks are not stored in the image memory, and instead information indicating the emptiness is stored. During supply of the print data to a printing section, empty data are generated from the information on the emptiness, while effective data are read out of the image memory. The empty data and the effective data are assembled and supplied to the printing section.