| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a game machine in which control means is improved.SOLUTION: A CPU of a game machine has first to third 8-bit registers and flag registers and can receive at least a calculation instruction and an 8-bit loading instruction. A second instruction is used to load a value stored in an address indicated with a pair register to the first register. The pair register can store a 16-bit value with the second and third registers. The first and second bits in the flag register function at least as first and second zero flags. The status of the first and second zero flags is changed in accordance with calculation results of the first and second instructions. The status of the first zero flag is not changed in accordance with the first register value after the second instruction is executed. The status of the second zero flag is changed in accordance with the first register value after the second instruction is executed.</p> |
