Commodore Plus 4 - Page 191

Programming Sound and Music 179
Table 3-4. Hexadecimal Musical Notes
Note
Octave 1
Octave 2
Octave 3 Octave 4 Octave 5
Example:
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
. 2000
. 2002
. 2005
. 2007
. 200A
• 200D
. 2010
. 2012
. 2015
. 2018
. 201B
. 201D
. 2020
. 2023
. 2025
. 2027
♦ 2029
. 202B
. 202D
. 202F
. 2031
. 2033
. 2035
. 2038
. 203A
• 203D
. 203F
• 2041
. 2043
. 2044
7
40
76
A9
D9
106
131
159
17F
1A3
1C5
1E5
A9
8D
A2
BD
8D
AD
29
ID
8D
AD
29
8D
BD
85
A5
29
F0
A5
29
D0
C6
D0
AD
09
8D
A5
29
F0
E8
E8
9F
11
00
01
0E
12
FC
00
12
11
7F
11
02
D8
A5
02
FA
A5
02
FA
D8
F0
11
80
11
A5
02
FA
FF
21
FF
FF
21
FF
FF
FF
21
FF
FF
LDA
STA
LDX
LDA
STA
LDA
AND
ORA
STA
LDA
AND
STA
LDA
STA
LDA
AND
BEQ
LDA
AND
BNE
DEC
BNE
LDA
ORA
STA
LDA
AND
BEQ
INX
INX
204
220
23B
254
26C
283
298
2AD
2C0
2D2
2E3
2F3
#$9F
$FF11
#$00
$2101,X
$FF0E
$FF12
#$FC
$2100,X
$FF12
$FF11
#$7F
$FF11
$2102,X
$D8
$A5
#$02
$2025
$A5
#$02
$202B
$D8
$2025
$FFll
#$80
$FF11
$A5
#$02
$203D
302 381 3C0
310 388 3C4
31E 38F 3C7
32 A 395 3CB
336 39B 3CE
342 3A1 3D0
346 3A6 3D3
356 3AB 3D6
360 3B0 3D8
369 3B4 3DA
371 3B9 3DC
379 3BD 3DE
Select voice 1 with maximum volume.
Store in sound selection register.
•X points to the data.
Get the low byte of the frequency.
Store in low byte of frequency for
voice 1.
Get high byte register.
Mask off low two bits.
OR in the high bits of frequency for
voice 1.
Store in high byte of frequency for
voice 1.
Get sound selection register.
Turn on sound.
Store sound selection register.
Get duration of note.
Store in temporary variable.
Get low byte of clock.
Look at bit 1.
Wait until it is set.
Get low byte of clock.
Look at bit 1.
Wait until it is clear.
Decrement duration.
If not done, wait again.
Get sound selection register.
Turn off sound.
Store sound selection register.
Get low byte of clock.
Look at bit 1.
Wait until it is set.
Increment .X by three to point at
next note.