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45578: Clear Large Window
Used by the routines at InitialiseGame and ClearLargeWindowWithAttributes.
Clears the pixels of the large window: 20 bytes wide and 160 pixel rows tall, starting at column 2 of the first pixel row.
ClearLargeWindow 45578 LD HL,16450 Point HL at the top left of the window.
45581 LD BC,5280 The window is 20 bytes wide (B) and 160 pixel rows tall (C).
45584 JR ClearPixelBlock Clear it using ClearPixelBlock.
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