For the Save Code to be updated, you will need to save your progress inside
the game. For example, in The Legend of Zelda, typically you would have to
lose a life in order to save. However, there is a secret cheat in this game
that allows you to save without dying by pressing Enter and
then Up and A on
the Player 2 controller. This will bring up the secret save screen. In other
games, like Final Fantasy, you'll need to visit an Inn, or in Dragon
Warrior, you'll need to talk to the King.
After you've saved your progress inside the game, if you press F10, or close
the game, you'll be greeted with a box with your new Save Code. You can copy
and paste this code to a text file on your computer for use at a later time
when you wish to continue your game.
Using the keyboard shortcuts, you can store this copy (Ctrl+C) this code,
and paste (Ctrl+V) it into a simple text editor (Windows Notepad is great
for this purpose) and save it to your computer.
Congratulations! You've successfully saved your game.