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B20A: Clear Large Window
Used by the routines at InitialiseGame and ClearLargeWindowWithAttributes.
Clears the pixels of the large window: 14 bytes wide and A0 pixel rows tall, starting at column 02 of the first pixel row.
ClearLargeWindow B20A LD HL,$4042 Point HL at the top left of the window.
B20D LD BC,$14A0 The window is 14 bytes wide (B) and A0 pixel rows tall (C).
B210 JR ClearPixelBlock Clear it using ClearPixelBlock.
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