So after giving some random cheat code KingPepe to make some stupid stuff (Who turned off the light in Somari ?), he decided to investigate in Harry's Legend and evetually foudn the value that was the value which was used to summon an enemy. We decided to do all values from 00 to FF, we stopped when the game was starting to freeze over and over.
The adress is: 0601
We used FCEUX.
Here's a list for all value with some extra comments added to them.
00 - Nothing, can debug again
01 - Glitch thing, freeze
02 - Harry
03 - Voldemort
04 - Unused enemy
05 - Level 2 enemy, yellow
06 - Mr Dursley
07 - Ghost (goes after you)
08 - Chess Piece
09 - Dudley
12 - Some glitchy thing that scrolls across slowly
13 - Lobster
14-1B - Discolored icebergs (1A may freeze)
1C - Splash
1D - Nothing
1E - Chandelier (different color)
1F - 1 Up
20 - Bottle
21-29 - Freeze
2A - Unknown (fish?)
2B and 2C - Ice sheet
2D - Freeze
2E-2F - Stationary Ice Sheet
30 - Moving thing (water?), use splash graphics.
31 - enemy from level 2 (blue palette).
32 - Fat enemy
33 - Orange ghost
34 - Chess Piece
35 - Dudley (Engineer palette from Titenic ?)
36 - Fire
37 - Fire
38 - Win fireworks
39 - Win fireworks
3A - Failing Chandelier wich change into a green dead rat after crashing, glitched sound.
3B - Chandelier that doesn't crash
3C - Bat
3D - Raining chandeliers
3E - Blue Chandelier which doesn't stop failing into the water
3F - Failing chandelier which turn into a dead black rat
40 - UFO
41 - same
42 - 2 failing chandelier over and over (same X/Y axes)
43 - Chandelier turning into octopus
44-47 - Failing chandelier (normal)
48 - Chess Piece
49 - Dudley from level 3
4A - Raining Chandeliers
4B - Chandeliers failing over and over diagonally, jump sound effect can be heard.
4C - Pink unused enemy
4D - Enemy from level 2
4E - Dursley with green palette (palette from Titenic ?)
4F - Pink/Orange Ghost
50 - Old woman (green)
51 - Purple white fire
52-53 - Freeze
54 - weird stuff using X/Y axes, freeze 2s after.
55 - Freeze
56 - Unknown (glitched line on top)
END (all values over 56 freeze the game)
Weird stuff:
85 - Freeze, something moves on bottom of the screen.
F9 - Something glitched moves around, bat dies, rat turn into dead bat, harry sometimes die.
These values were all tested in the first room of stage 1. There could be some changes in other levels. In level 5, some enemies loose their hitbox.