Commodore Amiga - The Equal-Tempered Musical Scale

The Equal-tempered Musical Scale
This section gives a close approximation of the equal-tempered scale. The "Period"
column gives the period count you enter into the period register.
See the explanatory notes following this table for determining AUDxLEN value.
Table 5-7:
The Equal-tempered Scale
Period Note
Ideal
Actual
Frequency Frequency
(with AUDxLEN=8)
(with AUDxLEN=8)
508 A
440.0
440.4
480
A#
466.2
466.1
453 B
493.9
493.9
428
C
523.3
522.7
404
C#
554.4
553.8
381
D
587.3
587.2
360
D#
622.3
621.4
339 E 659.3
659.9
320 F 698.5
699.1
302
F#
740.0
740.8
285 G 784.0
785.0
269
G#
830.6
831.7
254 A 880.0
880.8
240
A#
932.3
932.2
226 B 987.8
989.9
214 C 1046.5
1045.4
202
C#
1108.7
1107.5
190
D 1174.7
1177.5
180
D#
1244.5
1242.9
170
E
1318.5
1316.0
160 F
1396.9
1398.3
151
F#
1480.0
1481.6
143 G 1568.0
1564.5
135
G#
1661.2
1657.2
158 Audio Hardware