| 摘要 |
PURPOSE:To improve the reliability for information exchange between a computer and an external memory, by writing data from the external memory to a read-on area of the main memory of the computer in the read after write system and writing data to a normal variable information part in plural positions. CONSTITUTION:An interface CE1 of the system having various devices AD, which are connected to a computer CPU1 and include input/output device, and an external memory AM1 which exchanges information with the computer is provided with a flag circuit F1 which sets an indication flag for the excess of the address of the main memory of the computer over a maximum value due to noise or the like in respect to the control of address; and when this flag is transmitted to the computer, the read operation is cancelled immediately in the computer, and the operation is restarted again. In the information exchange between the computer and the external memory, information is written from the external memory to a read-on area of the main memory of the computer in the read after write system, and information is written to a normal variable information part in plural positions. |
