The code converter is a note found in the Ghorrock Prison during Desert Treasure II, where it is used alongside the magic lantern to solve the password for the chest containing the ruby key.
Transcript
▄ ▄▄
A
▄ ▄▄ ▄▄ ▄▄
J
▄ ▄ ▄
S
▄▄ ▄ ▄ ▄
B
▄▄ ▄ ▄▄
K
▄▄
T
▄▄ ▄ ▄▄ ▄
C
▄ ▄▄ ▄ ▄
L
▄ ▄ ▄▄
U
▄▄ ▄ ▄
D
▄▄ ▄▄
M
▄ ▄ ▄ ▄▄
V
▄
E
▄▄ ▄
N
▄ ▄▄ ▄▄
W
▄ ▄ ▄▄ ▄
F
▄▄ ▄▄ ▄▄
O
▄▄ ▄ ▄ ▄▄
X
▄▄ ▄▄ ▄
G
▄ ▄▄ ▄▄ ▄
P
▄▄ ▄ ▄▄ ▄▄
Y
▄ ▄ ▄ ▄
H
▄▄ ▄▄ ▄ ▄▄
Q
▄▄ ▄▄ ▄ ▄
Z
▄ ▄
I
▄ ▄▄ ▄
R
Gallery
The code converter when read.
Trivia
The codes seen when reading the item is Morse code, which are used in a number of objects made by Mod West, such as the quest list, Dream List, and Phantom Muspah scoreboard.