Routines
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55442: Scroll a region of the display file down a pixel row with wrapping
Used by the routine at 32694.
55442 LD HL,55448 Load HL with address of routine at 55448 (restore copied bitmap data from bottom to top of region to scroll)
55445 JP 55559 Jump to 55559 (scroll a region of the display file down a pixel row then return)
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