Commodore 128 Programmer's Reference Manual page 609

C128 HARDWARE SPECIFICATIONS 599
6581 SOUND INTERFACE DEVICE (SID)
CHIP SPECIFICATIONS
CONCEPT
The 6581 Sound Interface Device (SID) is a single-chip, three-voice electronic music
synthesizer/sound effects generator compatible with the 8502 and similar microprocessor
families. SID provides wide-range, high-resolution control of pitch (frequency), tone
color (harmonic content), and dynamics (volume). Specialized control circuitry mini
mizes software overhead, facilitating use in arcade/home video games and low-cost
musical instruments.
FEATURES
■ 3 TONE OSCILLATORS
Range: 0-4 kHz
■ 4 WAVEFORMS PER OSCILLATOR
Triangle, Sawtooth,
Variable Pulse, Noise
■ 3 AMPLITUDE MODULATORS
Range: 48 dB
■ 3 ENVELOPE GENERATORS
Exponential response
Attack Rate: 2ms-8 s
Decay Rate: 6 ms-24 s
Sustain Level: O-peak volume
Release Rate: 6 ms-24 s
■ OSCILLATOR SYNCHRONIZATION
■ RING MODULATION
■ PROGRAMMABLE FILTER
Cutoff range: 30 Hz-12 kHz
12 dB/octave Rolloff
Low pass, Bandpass,
High pass, Notch outputs
Variable Resonance
■ MASTER VOLUME CONTROL
■ 2 A/D POT INTERFACES
n ■ RANDOM NUMBER/MODULATION GENERATOR
■ EXTERNAL AUDIO INPUT
n
R
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