| 摘要 |
<p>A coprocessor system includes S-CPU (18) in a game machine body (12) and C-CPU (34) in a cartridge (14), and these two CPU's are formed by the same CPU cores and have the same memory mapping functions. The access time of M-ROM (22) in the cartridge (14) is shorter than the cycle time of the C-CPU (34), which is shorter than that of the S-CPU (18). A period of time during which the access of the S-CPU (18) to the M-ROM (22) is allowed is set longer than the access time of the M-ROM (22) and shorter than the cycle time of the S-CPU (18) by a signal SSYNC. Accordingly, the access of the C-CPU (34) to the M-ROM (22) is allowed by the signal SSYNC during surplus time.</p> |
