Routines
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E684: if open quote toggle cursor quote flag
Used by the routines at E632 and E716.
E684 C9 22 CMP #$22 compare byte with "
E686 D0 08 BNE $E690 exit if not "
E688 A5 D4 LDA $D4 get cursor quote flag, $xx = quote, $00 = no quote
E68A 49 01 EOR #%00000001 toggle it
E68C 85 D4 STA $D4 save cursor quote flag
E68E A9 22 LDA #$22 restore the "
E690 60 RTS
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