| 摘要 |
An apparatus is provided which allows computer programs to execute directly out of a large, sector addressable secondary memory by utilizing a relatively small, word addressable buffer memory. The system includes circuitry adapted to selectively transfer data between the secondary memory and the buffer memory so that a memory word request by the computational unit will result in either transferring the word from the buffer memory to the computational unit if the word is present in the buffer memory or transferring the data sector in which the requested word resides into buffer memory from secondary memory. The circuitry selectively transfers data sectors between the secondary and the buffer memory to continually maintain the data sector containing the addressed word and a predetermined number of directly adjacent data sectors from secondary memory in a portion of the buffer memory. In this manner, the requested word is located in the buffer memory along with data which is physically located on either side of the requested word in secondary memory. A data sector may consist of one or more data words.
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