| 摘要 |
PURPOSE:To increase the instruction fetching speed, by reading the cotents of a region of a local storage device which is designated through an instruction address designating part or a specific register and feeding this contents to a main storage device in the form of the address information. CONSTITUTION:A machine instruction of the BRANCH system is read out of a main storage device 1 and set to a main storage data register 2. Thus a BRANCH instruction process microprogram is selected and executed. In case the BRANCH is successful, an instruction address designating part of a machine instruction fetching microinstruction indicates a specific region LOA of a local storage 5. While an instruction address register LIA is designated in case the BRANCH is not successful. When the machine instruction fetching microinstruction is executed, the data is read out of the LOA or LIA to be fed to the device 1 via a local storage data register 6 an in the form of the address information. Then the machine instruction is read for an address which is designated by the data. |
