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GMS81008解密

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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)