Debug下标记寄存器的状态位英文缩写解释

 FLAGS SET (a 1-bit) CLEARed (a 0-bit)

   --------------- --------------- -------------------
 
         Overflow of = OV NV [No Overflow]
        Direction df = DN (decrement) UP (increment)
        Interrupt if = EI (enabled) DI (disabled)

             Sign sf = NG (negative) PL (positive)

             Zero zf = ZR [zero] NZ [ Not zero]
  Auxiliary Carry af = AC NA [ No AC ]

           Parity pf = PE (even) PO (odd)

            Carry cf = CY [Carry] NC [ No Carry]

  ==============
  The individual abbreviations appear to have these meanings:

  OV = OVerflow, NV = No oVerflow.  DN = DowN, UP (up).
  EI = Enable Interupt, DI = Disable Interupt.

  NG = NeGative, PL = PLus; a strange mixing of terms due to the
       fact that 'Odd Parity' is represented by PO (rather than
       POsitive), but they still could have used 'MI' for MInus.

  ZR = ZeRo, NZ = Not Zero.
  AC = Auxiliary Carry, NA = Not Auxiliary carry.
  PE = Parity Even, PO = Parity Odd.  CY = CarrY, NC = No Carry.