This is the sequence of characters that map to the keys in BFDIA 5b:
U, D, L, R, and J correctspond to Up, Down, Left, and Right arrow keys respectively. J stands for Space (jump).
Z, X stand for Switch characters and Restart level, respectively.
E and W stand for Enter and Wait, respectively.
Enter at least 1 character per frame, and seperate frames with spaces. If a frame is supposed to be waiting, use W to wait.
Example TAS: R R R R R R R R R R RJ R R R R R RJ R R J R J R L R
Please note that the above is just an example and does not correctspond to a level in the game. Also note that you should have Quirks Mode enabled.