SMB3 Extended 1-Up Explained

Channel:

Xkeeper

Subscribers:

1,570

Published on January 13, 2008 5:28:09 PM ● Video Link: https://www.youtube.com/watch?v=BOhJk0PAp1A

Game:

Super Mario Bros. 3 (1988)

Duration: 2:19

75,104 views

577

this video is old and bad, watch this one instead https://www.youtube.com/watch?v=2VHySu_jaPw

Explanation:
The "glitch" involves the tail wag sound effect and the 1-up sound effect's calls getting merged. The sound code reads both, treats it like a 1-up sound effect, but writes the wrong length, so it plays more notes than it should. We're still doing some research here, but the general consensus among us is that it's just a glitch.

Timing:
Simply wag Mario's tail 5 frames (1/12sec) after the "1UP" symbol appears. Done right, the sound effects will conflict and the longer "version" will play. This is extremely difficult to replicate on purpose, which might explain why it was never caught.

An ongoing discussion of the topic can be found here.
http://jul.rustedlogic.net/thread.php?id=1819

Technical explanation:
The tail wag sound effect is written (B0), then the 1-UP (40) is ORed, resulting in F0. It writes the wrong "length" for the 1-up, and as it reads bytes in reverse, the beginning is broken instead of the end.

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