| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine characterized by processing by control means.SOLUTION: A first jump instruction, a second jump instruction and a third jump instruction are stored in a ROM; a second jump destination address of the second jump instruction is a value of 8 times as much as a value exceeding, by one, a maximal value that can be represented by 3 bits; lower 3 bits of the second jump instruction is equal to lower 3 bits of first jump data; a CPU is so configured as to carry out calculation of subtracting zero from a value of a first register when the third jump instruction is received, carry out operation of setting two zero flags and jumping to a third jump destination address if the result of the calculation is zero, or clear the two zero flags and execute an instruction following the third jump instruction if the result of the calculation is not zero; and the first register is one of an accumulator and a general-purpose register.SELECTED DRAWING: Figure 114 |
