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66AF: Check for keyboard input
Used by the routine at 669D.
66AF LD A,$EF Select 0-6
66B1 IN A,($FE) Get keypresses
66B3 BIT 1,A Check for '9'
66B5 JR Z,$66BC Jump if so
66B7 BIT 2,A Check for '8'
66B9 JR Z,$66CC Jump if so
66BB RET
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