Vertical Speed Conservation (VSC) 

I explain how vertical speed conservation (VSC) works. This trick has been known for a very long time, and it’s been used to save several A presses in the A button challenge. So I figured I’d make a video explaining it in detail.
Here’s a summary. Mario’s vertical speed (VS) is a variable that measures how many units upwards he’s moving. Normally, VS is set to 0 when Mario lands on the ground. However, there are several ways to land without it being set to 0, such as dive recovering or ground pounding. Once on the ground with a non-zero VS, most actions will cause VS to reset to 0 anyway. Nevertheless, Mario can still punch, crouch, and breakdance without causing it to reset to 0. If Mario manages to become airborne (e.g. by punching his way to an edge), then his VS will reactivate. This process is known as vertical speed conservation (VSC). VSC has been extremely useful in the A button challenge, since VSC puts Mario into the falling state, during which he can grab ledges and ground pound. Thus, VSC can often provide a slight but critical height advantage as compared to a standard DR.
Big thanks to Tyler Kehne for telling me a lot of what I know about vertical speed conservation.
The song I used at the end was a Benny Hill Techno Remix Demo made by Dj Freshwinter, which you can find here: • Benny Hill Techno Remi...
Additional Notes
(1) During the 3 tests in which I compared a DR and VSC 26, the max heights I listed were all truncated to the nearest integer. In reality, some of those moves could achieve a fraction of a unit more than the values I listed. However, the boxes I hacked in for testing could only be placed at integer heights, and so I was limited to integer height differences.
(2) If you want the V Speed rom hack (or any other rom hack that I've used), you can download it from here: drive.google.com/open?id=0B3J...
Timestamps:
00:00 Intro
00:48 Storing VS
02:48 Maintaining VS
03:52 Reactivating VS
05:10 Positive VSC vs. Negative VSC
07:27 DR vs. VSC 26
09:37 Limitations of VSC
10:57 VHSC
11:54 Applications

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