sb: update graphics

games/sb/duck_score.s

@@ -83,6 +83,9 @@ score_inc_d1:
 	cld				; back from decimal mode
 
 update_d1_score:
+
+	; update ones digit
+
 	lda	D1_SCORE
 	and	#$f
 	tay
@@ -91,6 +94,24 @@ update_d1_score:
 	lda	number_sprites_h,Y
 	sta	score1_h+4
 
+	; check if leading zero
+
+	lda	D1_SCORE_H
+	and	#$f
+	bne	d1_score_no_lead_zero
+
+	lda	D1_SCORE
+	and	#$f0
+	bne	d1_score_no_lead_zero
+
+	lda	#<space_sprite
+	sta	score1_l+3
+	lda	#>space_sprite
+	sta	score1_h+3
+	jmp	done_d1_score
+
+d1_score_no_lead_zero:
+
 	lda	D1_SCORE
 	lsr
 	lsr
@@ -102,6 +123,9 @@ update_d1_score:
 	lda	number_sprites_h,Y
 	sta	score1_h+3
 
+done_d1_score:
+
+
 	rts