| 摘要 |
PURPOSE:To make the data transfer possible between a host computer and a high- speed external memory device by performing address conversion through operation by microprograms in an input-output control system. CONSTITUTION:Addresses from a host computer 1 are set in the input latch/buffer 4 of a control circuit 10, and the following address conversion is performed by the operation function of a microprocessor 3. The continuous block addresses from the host computer 1 are converted to the desultory addresses of a magnetic disc 2 as an external memory device. Hence, even when the read speed of the continuous blocks from the magnetic disc is higher than the speed of transferring the blocks to the host computer 1, reading out the desultory blocks from the disc 2 suffices in spite of sending the continuous block addresses from the host computer 1, and therefore the data transfer between the host computer 1 and the high-speed external memory device is made possible without any transfer skip. |
