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7C90: Flash or unflash a whole menu line
Used by the routine at TITLE_SCREEN.
Walks a line of attributes calling one or other of the two routines above, so a whole option lights up rather than a single character.
HIGHLIGHT_LINE 7C90 RRCA
HIGHLIGHT_LINE_0 7C91 AND $03
7C93 JR Z,HIGHLIGHT_LINE_2
7C95 CALL UNHIGHLIGHT
HIGHLIGHT_LINE_1 7C98 DEC A
7C99 DJNZ HIGHLIGHT_LINE_0
7C9B RET
HIGHLIGHT_LINE_2 7C9C CALL HIGHLIGHT
7C9F JR HIGHLIGHT_LINE_1
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