Routines
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73F0: Message code $0C: HIS or YOUR (actor)
Returns the word YOUR if the actor is Bilbo (object 0) and HIS for anyone else, with Z reset so that the interpreter prints it. The entry at 73F3 is shared with 73FE.
73F0 LD A,($B5DB) A = the current actor
This entry point is used by the routine at 73FE.
73F3 LD DE,$0990 DE = HIS
73F6 AND A Is the actor Bilbo (0)?
73F7 RET NZ No: HIS is right, and Z is already reset, so the interpreter prints it
73F8 LD DE,$0BEA Yes: DE = YOUR instead
73FB OR $01 Make A non-zero...
73FD RET ...so YOUR gets printed
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