| ← B37A | Map | B3FD → |
B396: Add the points to the score and redraw it
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Adds this frame's points into the on-screen score and redraws it. Once the live score reaches the top high-score figure, the overtake flag goes up. The stored high-score number is not changed here.
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| add_points_to_score | B396 | LD HL,score_units | Point at the score's units digit and clear its terminator bit before the edit. | ||||
| B399 | RES 7,(HL) | ||||||
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The score is eight ASCII decimal digits, most significant first. The last digit is never touched and stays '0'. The score is therefore always a multiple of 10, and each point count is worth ten times its value.
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| score_bump_thousands | B39B | LD HL,score_thousands | Re-point at the thousands digit and bump it once per full hundred taken off C. | ||||
| B39E | LD A,C | ||||||
| B39F | SUB $64 | ||||||
| B3A1 | JR C,score_to_hundreds | ||||||
| B3A3 | LD C,A | ||||||
| B3A4 | CALL inc_score_digit | ||||||
| B3A7 | JR score_bump_thousands | ||||||
| score_to_hundreds | B3A9 | INC HL | Advance to the hundreds place. | ||||
| score_bump_hundreds | B3AA | LD A,C | Bump the hundreds digit once per full ten taken off C. | ||||
| B3AB | SUB $0A | ||||||
| B3AD | JR C,score_to_tens | ||||||
| B3AF | LD C,A | ||||||
| B3B0 | CALL inc_score_digit | ||||||
| B3B3 | JR score_bump_hundreds | ||||||
| score_to_tens | B3B5 | INC HL | Advance to the tens place. | ||||
| score_bump_tens | B3B6 | LD A,C | Bump the tens digit once per unit taken off C; the units digit stays '0'. | ||||
| B3B7 | OR A | ||||||
| B3B8 | JR Z,score_redraw | ||||||
| B3BA | SUB $01 | ||||||
| B3BC | LD C,A | ||||||
| B3BD | CALL inc_score_digit | ||||||
| B3C0 | JR score_bump_tens | ||||||
| score_redraw | B3C2 | LD HL,score_units | Restore the terminator bit, then print the live score double-height at the score readout. | ||||
| B3C5 | SET 7,(HL) | ||||||
| B3C7 | LD HL,loading_screen | ||||||
| B3CA | LD DE,score_display | ||||||
| B3CD | PUSH DE | ||||||
| B3CE | LD C,$47 | ||||||
| B3D0 | CALL print_string_2x | ||||||
| B3D3 | POP DE | ||||||
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QUIRK: during the compare the live score's last digit carries the print terminator flag, which the high-score number's plain digits lack. The last digit is therefore never found equal, and the all-digits-equal exit is unreachable. A tie with the high score counts as an overtake.
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| B3D4 | LD HL,highscore_entries | Compare the live score digits against the high-score number, most significant digit first. | |||||
| B3D7 | LD B,$08 | ||||||
| score_overtake_loop | B3D9 | LD A,(DE) | Test one digit pair; equal advances, live-below stops, live-above is an overtake. | ||||
| B3DA | CP (HL) | ||||||
| B3DB | JR Z,score_overtake_next | ||||||
| B3DD | JR NC,score_overtake_set | ||||||
| B3DF | XOR A | Live score is below the high score: clear the overtake flag and stop. | |||||
| B3E0 | LD (highscore_passed),A | ||||||
| B3E3 | RET | ||||||
| score_overtake_next | B3E4 | INC HL | Digits equal so far: advance to the next pair. | ||||
| B3E5 | INC DE | ||||||
| B3E6 | DJNZ score_overtake_loop | ||||||
| B3E8 | XOR A | All 8 digits equal: clear the overtake flag and stop. Unreachable – see the quirk note. | |||||
| B3E9 | LD (highscore_passed),A | ||||||
| B3EC | RET | ||||||
| score_overtake_set | B3ED | LD A,$01 | Live score has reached or passed the high score: set the flag and redraw the high-score readout on screen from the live score. | ||||
| B3EF | LD (highscore_passed),A | ||||||
| B3F2 | LD HL,score_readout | ||||||
| B3F5 | LD DE,score_display | ||||||
| B3F8 | LD C,$47 | ||||||
| B3FA | JP print_string_2x | ||||||
| ← B37A | Map | B3FD → |