Sound chip registers
Byte Description
00 Low Frequency value of note for
voice 1
01 High Frequency value of note for
voice 1
02 Low Pulse Rate for voice 1
03 High Pulse Rate for voice 1
04 Waveform for voice 1
05 Attack/Decay for voice 1
06 Sustain/Relese for voice 1
07 Low Frequency value of note for
voice 2
08 High Frequency value of note for
voice 2
09 Low Pulse Rate for voice 2
10 High Pulse Rate for voice 2
11 Waveform for voice 2
12 Attack/Decay for voice 2
13 Sustain/Release for voice 2
14 Low Frequency value of note for
voice 3
15 High Frequency value of note for
voice 3
16 Low Pulse Rate for voice 3
17 High Pulse Rate for voice 3
18 Waveform for voice 3
19 Attack/Decay for voice 3
20 Sustain/Release for voice 3
21 High Frequency Cut-Off
22 Low Frequency Cut-Off
23 Turn on filtering
24 Set volume for all three voices
Plus select filter type
25 Access To Output of envelope gen
erator of voice 3
27 Digitised output from voice 3
28 Digitised output from envelope
generator 3
90
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