| 摘要 |
PROBLEM TO BE SOLVED: To effectively read out data from a memory device of low-speed. SOLUTION: A CPU 11 sends out an offset address and a variable address to a system bus SYSAD sequentially for requiring look-ahead of the data. In response to this, a memory 13 writes the variable address in the offset address. An input-output I/O device 12, when detecting the offset address, generates a look-ahead address by using the variable address to send out the look-ahead address to the memory device 2. The memory device 2 sends out the data corresponding to the look-ahead address to the I/O device 12, which holds the data. The CPU 11 sends out the address of the data to the system bus SYSAD. The I/O device 12 decides whether the address is matched with the look-ahead address, and if both addresses agree, provides the data which is looked ahead and held in the CPU 11.
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