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5C6B: DF-SZ - The number of lines in the lower part of the screen
Initialised by the routine at NEW, read by the routines at PO_TV_2, PO_SCR, CL_SET, AUTO_LIST, LIST and INPUT, and updated by the routines at CLS and MAIN_EXEC. This system variable is accessed by some routines via the IY register at IY+$31.
DF_SZ 5C6B DEFB $02
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