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60013: Set Border And Speaker State
Used by the routines at Initialise_New_Game and Draw_MenuBackground.
Output A to port 254 and remember it at BorderSpeakerState.
Set_BorderSpeakerState 60013 OUT (254),A Send A to the speaker (port 254).
60015 LD (60012),A Store it at BorderSpeakerState.
60018 RET Return.
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