Nintendo GAME BOY Programming Manual page 201

Octave 4
Interval Code
C40
C41
D40
D41
E40
F40
F41
G40
G41
A40
A41
B40
Note 1: A value of 1 in the right-most position of the interval symbol indicates a
Ι
A is represented as the
Τ
Example: C01=C
Note 2: When specifying a tie, first set the step time (length) and velocity + gate time. (This can be
skipped if unchanged from the previous sound.)
A tie cannot be used at the start of a block.
Note 3: When specifying KYU (a rest), first set the step time (length). (This can be skipped if
unchanged from the previous sound.)
Settings Example:
Length
db 024,
Length
db 048,
Length
db 096
Octave 5
Interval Code
B0h C50 BCh
B1h C51 BDh
B2h D50 BEh
B3h D51 BFh
B4h E50 C0h
B5h F50 C1h
B6h F51 C2h
B7h G50 C3h
B8h G51 C4h
B9h A50 C5h
BAh A51 C6h
BBh B50 C7h
Τ
of one interval lower.
for interval 0.
Gt & Vel Interval
P99+V99, C30
Gt & Vel Tie
P90+V95, TIE
Rest
KYU
201
Chapter 7: Super Game Boy Sound
Misc.
Tie TIE C8h
Rest KYU C9h
Code
;(0A4h) for specifying an interval
Code
;(0C8h) for specifying a tie
Code
;(0C9h) for specifying a rest
Τ
.