Assembler für Intel 80x86

Register

Register der 16-Bit-Prozessoren

 16 Bit    8 Bit
  AX      AH   AL    Accumulator
  BX      BH   BL    Base
  CX      CH   CL    Count
  DX      DH   DL    Data
  SP                 Stack Pointer
  BP                 Base Pointer
  SI                 Source Index
  DI                 Destination Index
  

  CS    Code
  DS    Data
  SS    Stack
  ES    Extra
  

Flags

  +---+---+----+---+---+---+---+---+---+---+---+---+---+---+---+
  | x | NT|IOPL| OF| DF| IF| TF| SF| ZF| x | AF| x | PF| x | CF|
  +---+---+----+---+---+---+---+---+---+---+---+---+---+---+---+
   15   14   13  12  11  10  9   8   7   6   5   4   3  ???  0

   AF: Auxiliary Carry       PF: Parity
   CF: Carry                 SF: Sign
   DF: Direction (strings)   TF: Trap (single step)
   IF: Interrupt Enable      ZF: Zero
   OF: Overflow              NT: Nested Task
   IOPL: I/O Privilege Level
   X=Don't Care