| 摘要 |
PURPOSE:To require no selecting switch and setting operation of a start program by comparing the writing data of a ROM/RAM with reading data and discriminating whether the program to be started is present in a ROM or RAM according to the compared result. CONSTITUTION:A device is started by the ROM 2 in which an initial program loader IPL is described and arbitrary data is written to an address for discriminating the ROM/RAM 3. Then, the data of the same address of the ROM/RAM 3 is read to compare both the data, when the data is different, it is discriminated to be the ROM and the data of the ROM is read and started. When the data coincides, the writing data is changed to compare with the data of the same address again and if it coincides again, it is discriminated to be the RAM. Then, a data transfer request is carried out to a host system 6, the transferred data is stored in the RAM 3, thereafter the data of the RAM 3 is started. |
