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51417: Move Rows Up
Used by the routine at ScrollViewUp.
Copies 120 rows of the screen buffer upwards, by jumping into the code at ShiftViewLeftByte.
MoveRowsUp 51417 LD (23770),SP Write SP at SavedStackPointer.
51421 LD B,120 B is 120.
51423 LD SP,59003 Set SP to 59003.
51426 LD HL,58811 Point HL at ScreenBuffer.
51429 JP ShiftViewLeftByte_Copy Jump to ShiftViewLeftByte_Copy.
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