| 摘要 |
<p>In an information processing system having a paging mechanism in which a part of a memory address space of a CPU (110) is used as a page frame (90) and an expanded memory is accessed through this page frame (90), the size of the expanded memory of the system is checked upon initialization of the system, and an expanded memory set register (200, 202, ...) provided for each memory set (130, 132, ...) constituting the expanded memory is controlled on the basis of the check result, thereby preventing the CPU from accessing a specified memory set. The same I/O port addresses of the register (211, 221, ...) concerning the paging mechanism are prevented from being present in both the standard internal expanded memory (300) and an external expanded memory (400).</p> |
