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E591: find and set the pointers for the start of logical line
Used by the routine at E5CD.
E591 E4 C9 CPX $C9 compare it with the input cursor row
E593 F0 03 BEQ $E598 if there just exit
E595 4C ED E6 JMP $E6ED else go ??
E598 60 RTS
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