Routines
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55408: Scroll a region of the display file up a pixel row with wrapping
Used by the routine at 32694.
55408 LD HL,55414 Load HL with address of routine at 55414 (restore copied bitmap data from top to bottom of region to scroll)
55411 JP 55470 Jump to 55470 (scroll a region of the display file up a pixel row then return)
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