| 摘要 |
<p>PURPOSE:To utilize the advantage of a mask ROM and to eliminate the inability of rewriting, by rewriting the data in a specified range, in which bug is produced, in a writable ROM when the bug is yielded in the mask ROM. CONSTITUTION:A computer comprises an input processing part 1, a logic operation part 2, a memory circuit 3, an output processing part 4, a control part 5, which controls the processing part 1, the operation part 2 and the processing part 4, and the like. The memory circuit part 3 is provided with a mask ROM6, a RAM7, and writable ROMs 8 and 9. When bug is produced in a part of the ROM6, the data in a specified range, in which the bug is produced, is rewritten in the ROM9.</p> |
