I've created a short video presenting my findings about the Magic Start Button. It confirms what most already know regarding when to push start. It includes a visual aid to show the precise timing as well as some technical explanations.

Awesome work on this very thorough. Respect

This is very cool, thanks man.

Greatly appreciated. I just started learning this game and this will help a ton. Thanks for your hard work man!

Thx I was trying to find a video like that everywhere!

Great video qbradq!

I want to tell just to important things:

1.- Is not the same to reset to turn off the game. To have it the exact button you need it to power off. Is my experience. Because all data starts new when is power off. So is most accurate to turn power off to press the button each time. But is respectful if you just one to reset, but that's the reason Technodrome appears less.

2.- This is super important. I press the start button the exact second of frame that the Ultra credits from the beginning are gone. So with this, no matter if Emulator or Physical NES. I got the Technodrome first cave location almost all the time, I think if I am 100% accurate the exact instant the ultra credits are gone. I have got the technodrome like 99% of the time. So for me that start button and that exactly moment works, if somebody once want to try it, consistent. So by that you will have 2 options: 1.- The one that I told you and 2.- The time the mayority press the start button. (2 good options for Technodrome first cave).

You are right CL:

I am just saying that the time that I press start it works for me in the real physical NES. The exact fram that Ultra credits are gone. It works for me in both versions, physical real NES and real emulator too. Well is just my experience in the game and you could use it as a second option to have Technodrome in first cave. It has work for me, so anybody who wants could try it, if they want. Thanks CL.