Instruction - String Instruction

Card Puncher Data Processing


String instruction are instruction for string


  • MOVS,
  • CMPS,
  • SCAS,
  • LODS,
  • and STOS

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Z80 Registers
CPU Register - DF Control Flag

The direction flag (DF, located in bit 10 of the EFLAGS register) controls string instructions. Setting the DF flag causes the string instructions to auto-decrement (to process strings from high...

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