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69CD: Toggle the range indicator on or off
Used by the routine at 663D.
69CD LD A,($5DD6) Get bike proximity
69D0 CP $03 Are we in range?
69D2 LD HL,$5AD6 Pointer to attribute buffer
69D5 JR Z,$69DD Move forward if we're in range
69D7 RES 7,(HL) Not in range, turn FLASH off
69D9 INC HL
69DA RES 7,(HL)
69DC RET
69DD SET 7,(HL) In range, turn FLASH on
69DF INC HL
69E0 SET 7,(HL)
69E2 RET
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