$C9-$CA/201-202:   Cursor X/Y (Line/Column) position at start of Input

Kernal-Reference:

 CPX $C9     : $E591 $E624
 DEC $C9     : $E8FA
 LDA $C9     : $E61B
 LSR $C9     : $E87C
 STA $C9     : $F161

 LDA $CA     : $E628
 STA $CA     : $F15D

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