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5C8C: SCR-CT - Scroll counter
Used by the routines at SAVE_ETC, PO_SCR, CL_ALL, MAIN_EXEC and INPUT. This system variable is accessed by some routines via the IY register at IY+$52. It is decremented by the routine at PO_SCR whenever the PRINT position moves to the next line down; when it reaches zero, the 'scroll?' prompt is printed.
Input
Output
SCR_CT 5C8C DEFB $00
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