| 摘要 |
<p>PURPOSE:To enable a program to be updated easily in a writing device for ROM in the case of rewriting a firmware of a magnetooptical disk device, for example. CONSTITUTION:A memory circuit 46 storing a process program for rewriting and a process program for a procedure of rewriting process is connected to a central processing unit 12 of an external device and a rewritable ROM 14, and address space is switched. Thereby, the process program for a procedure of rewriting process is processed in the central processing unit 12 and the process program for rewriting is written in a ROM 14.</p> |
