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AC3E: Scroll Screen
Used by the routine at PrintCharacter.
Scroll the screen and put the cursor back on the default line.
ScrollScreen AC3E EXX Keep the caller's BC, DE and HL safe in the shadow registers while the screen scrolls.
Scroll the screen up.
AC3F CALL $0DFE Call CL_SC_ALL.
Reset the print position.
AC42 CALL SetDefaultScreenPosition Call SetDefaultScreenPosition.
AC45 EXX Bring back the caller's BC, DE and HL.
AC46 RET Return.
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