Processor with an overwriteable microcode memory.

摘要

A microcode controlled type processor having a stored overwritable memory device (11) therein for microcode storage is disclosed. The processor includes a setting device (12) for setting a virtual memory space and a conversion table device (14) showing the relation of coordination between the address information of the virtual memory space designated by the setting device and the address in a real memory space inclusive of the memory device. A predetermined address in the virtual memory space is designated to read out data and the contents of the conversion table device (14) may be modified. In this manner, a large size program or a plurality of programs can be executed immediately without the size of the executable program being limited by the size of the real memory space.