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BE55: Scroll Screen
Used by the routine at PrintCharacter.
Scroll the text up and put the cursor back on the top line.
ScrollScreen BE55 EXX Switch to the shadow registers.
Scroll the text up.
BE56 CALL $0DFE Call CL_SC_ALL.
Put the cursor back at the top of the text window.
BE59 CALL SetDefaultScreenPosition Call SetDefaultScreenPosition to put the cursor back at the top.
BE5C EXX Switch back to the main registers.
BE5D RET Return.
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