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BA40: Score carry: digit 2
Used by the routine at score_carry_mid.
Increments H (digit 2). If it wraps calls score_clamp (score overflow clamp).
score_carry_hi BA40 LD A,H A = H
BA41 INC A INC A
BA42 CP $3A CP $3A
BA44 CALL Z,score_clamp CALL Z,$BA4B
BA47 LD H,A LD H,A
BA48 LD A,$30 LD A,$30 ; Reset digit 1 to '0'
BA4A RET
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