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FFF0: read/set X,Y cursor position
Used by the routines at AAE8 and B39E.
this routine, when called with the carry flag set, loads the current position of the cursor on the screen into the X and Y registers. X is the column number of the cursor location and Y is the row number of the cursor. A call with the carry bit clear moves the cursor to the position determined by the X and Y registers.
FFF0 4C 0A E5 JMP $E50A read/set X,Y cursor position
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