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BB03: Score borrow: digit 2
Used by the routine at score_borrow_mid.
score_borrow_hi BB03 LD A,H A = H; DEC A
BB04 DEC A
BB05 CP $2F CP $2F
BB07 CALL Z,reset_score If underflow, call reset_score (reset score to zero)
BB0A LD H,A LD H,A
BB0B LD A,$39 LD A,$39 ; Reset digit 1 to '9'
BB0D RET
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