Routines
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718e: Clears the entire ZX Spectrum attribute file.
PAPER=black, INK=white.
718e ld hl,$5800 Attribute file
7191 ld b,$5b MSB to stop at (end of attribute file)
7193 ld c,$47 Colour byte: PAPER=black, INK=white, BRIGHT
7195 jr $7187 Fill memory
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