FLAGS - Intel 8086 Family Flags Register

      |11|10|F|E|D|C|B|A|9|8|7|6|5|4|3|2|1|0|
        |  | | | | | | | | | | | | | | | | +---  CF Carry Flag
        |  | | | | | | | | | | | | | | | +---  1
        |  | | | | | | | | | | | | | | +---  PF Parity Flag
        |  | | | | | | | | | | | | | +---  0
        |  | | | | | | | | | | | | +---  AF Auxiliary Flag
        |  | | | | | | | | | | | +---  0
        |  | | | | | | | | | | +---  ZF Zero Flag
        |  | | | | | | | | | +---  SF Sign Flag
        |  | | | | | | | | +---  TF Trap Flag  (Single Step)
        |  | | | | | | | +---  IF Interrupt Flag
        |  | | | | | | +---  DF Direction Flag
        |  | | | | | +---  OF Overflow flag
        |  | | | +-+---  IOPL I/O Privilege Level  (286+ only)
        |  | | +-----  NT Nested Task Flag  (286+ only)
        |  | +-----  0
        |  +-----  RF Resume Flag (386+ only)
        +------  VM  Virtual Mode Flag (386+ only)

        - see   PUSHF  POPF  STI  CLI  STD  CLD


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