Routines
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97FF: Go on only if the action was done for real, and worked
Used by the routines at SIDE_DOOR_UNLOCKED, GOBLINS_DOOR_OPENED, BARREL_THROWN, THORIN_KILLED, BOAT_BOARDED and SIDE_DOOR_CLOSED.
Otherwise it leaves the handler that called it. This is what the records keyed 0 after a handler use: they run whether or not the handler succeeded, and this is how they find out.
ONLY_IF_DONE 97FF PUSH BC Done for real, and it worked: carry on
9800 LD BC,(DOING_IT)
9804 LD A,C
9805 AND B
9806 JR NZ,ONLY_IF_DONE_0
9808 POP BC Otherwise out of the caller
ONLY_IF_DONE_0 9809 POP BC
980A RET
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