Intermediate Event Editing Video Tutorials

To maybe clarify a bit, A9 is hex for "LDA", the #$20 is the value that is being used by LDA, hence A9 20. 20 by itself is actually the command "JSR" which jumps code; but by issuing A9 first, it knows to look for another byte (sometimes two depending on the accumulator size) to use as a part of the command.

Also, if you are editing events, they don't use the processor code the same way your example in C3 does. All of the commands in the event area are actually subroutines defined in assembler code elsewhere to simplify the amount of hex used to make the events, its like it is its own programming language, with only a very small set of things it can do... all related to events. For instance, A9 in the event code actually calls a function that loads the title screen.

Happy Hacking.