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26587: PLUS action .
HL pointer to flag
ACTION_PLUS 26587 INC BC BC points to value to add
26588 LD A,(BC) A=value to add
26589 ADD A,(HL) Add A to current value of flag
26590 JR NC,ACTION_MINUS_0 If result has not overflowed, set flag to new value and next action
26592 LD (HL),255 If result has overflowed, set flag to 255
26594 JR ACTION_CLEAR_0 Next action
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