Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Key to Flags
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     See also: Flags Summary
 
     In the summary screens, symbols are used to indicate
     flags. The first row of the display has a one-character
     abbreviation for the flag name. Only flags common to all
     processors are shown.
 
     O  Overflow         T  Trap        A  Auxiliary Carry
     D  Direction        S  Sign        P  Parity
     I  Interrupt        Z  Zero        C  Carry
 
     The second line has codes indicating how the flag can be affected.
 
     Code      Effect
 
     1         Sets flag unconditionally
     0         Clears flag unconditionally
     ?         Randomly sets or clears flag
     blank     No effect on flag
     ±         Affects flag according to result of instruction
                                    -♦-