| 摘要 |
PURPOSE:To prevent the redundancy of a circuit from being increased by providing this information processor with a selecting means for selecting either one of the 1st and 2nd memories and impressing address information outputted from a processing means to the memory selected based upon the selecting information. CONSTITUTION:The information processor is provided with a processing means 1, the 1st memory 11 connected to the means 1 through a bus 2, the 2nd memory 12 connected to the means 1 through the bus 2, the selecting means 3 for selecting the 1st memory 11 or the 2nd memory 12, and a means 4 for impressing address information outputted from the means 1 to the 1st memory 11 or the 2nd memory 12 selected based upon the selecting information of the means 3. Thereby, a memory area can be mapped in a RAM mounted on a memory board 12 and it is unnecessary to mount a complex ROM/RAM switching circuit on a CPU board. Consequently, the redundancy of a redundant circuit allowed to correspond both of development and shipment can be suppressed to a low level. |
