Routines
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D55F: Clear the screen and make the border black
Used by the routines at main, game_over_summary and game_complete_msg.
Black border, the attributes to bright yellow on black, and then the bitmap cleared.
clear_scrn D55F XOR A black border
D560 OUT ($FE),A
D562 CALL clr_attribute_memory
D565 JR clr_bitmap_memory
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