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  CONST
      { bit masks for Flags register }
      FCarry     = $0001;    FParity   = $0004;
      FAuxiliary = $0010;    FZero     = $0040;
      FSign      = $0080;    FOverflow = $0800;
 
  Unit:     Dos
 
  Context:  Intr, MsDos
 
  Description
 
    The flag bit constants are used for testing individual bits in the
    Flags register after a call to the Intr or MsDos procedure. Use the
    Registers record type, defined in the Dos unit, and the AND
    operator to compare a bit with one of these masks:
 
       IF (registers_variable.Flags AND FCarry) <> 0 THEN . . .