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45570: Clear Message Area
Used by the routine at DrawGameScreen.
Clears the pixels of the message area at the bottom of the screen: 24 bytes wide and 48 pixel rows tall, starting at row 18.
ClearMessageArea 45570 LD HL,20544 Point HL at the first pixel row of row 18.
45573 LD BC,6192 The area is 24 bytes wide (B) and 48 pixel rows tall (C).
45576 JR ClearPixelBlock Clear it using ClearPixelBlock.
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