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64DC: Scroll the screen left 8 columns
Used by the routines at 6500 and F918.
64DC LD B,$08 There are 8 columns to scroll
64DE PUSH BC
64DF CALL $609B Scroll one column left
64E2 POP BC
64E3 DJNZ $64DE Jump back till all 8 columns are done
64E5 RET
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