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关于GMS81004部分特征介绍：
A register
- 8bit Accumulator.
- In the case of 16-bit operation, compose the lower 8-bit of A, upper 8bit in Y (16-bit Accumulator)
- In the case of multiplication instruction, execute as a multiplier register. After multiplication operation, the lower 8-bit of the result enters. (Y*A YA)
- In the case of division instruction, execute as the lower 8-bit of dividend. After division operation, quotient enters.
X register
- General-purpose 8-bit register
- In the case of index addressing mode within direct page(RAM area), execute as index register.
- In the case of division instruction, execute as register.
Y register
- General-purpose 8-bit register
- In the case of index addressing mode, execute as index register
- In the case of 16-bit operation instruction, execute as the upper 8-bit of YA (16-bit accumulator).
- In the case of multiplication instruction, execute as a multiplicand register. After multiplication operation, the upper 8-bit of the result enters.
- In the case of division instruction, execute as the upper 8-bit of dividend. After division operation, remains enters.
- Can be used as loop counter of conditional branch command. (e.g.DBNE Y, rel)
