Routines
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6E8B: Backspace to the start of the line
Used by the routines at READ_LINE and GET_KEY.
What the key that gives $18 does.
RUB_OUT_LINE 6E8B BIT 7,B
6E8D RET NZ
6E8E LD A,$08
6E90 CALL PRINT_CHAR
6E93 INC B
6E94 DEC HL
6E95 JR RUB_OUT_LINE
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