Technical data

49
Sound Controller
The sound controller is the Vibra 16C chip from Creative Labs. Integrated onto the system board, the
controller is a complete, full-featured MPC 2.0 compliant sound implementation, providing full
Sound Blaster Pro functionality and compatibility. The sound controller has the following features
and specifications:
Feature
Specification
Sound Controller Creative Labs Vibra 16C
Audio Resolution 16-bit
Sound Blaster Compatibility Sound Blaster Pro, with Sound Blaster 16 register
compatibility
MIDI/UART Mode/
Compatibility
Roland MPU401
Bus Interface 16-bit ISA
CODEC 16-bit Sigma Delta Stereo
CODEC FIFO 4 Samples
FM Synthesizer Yamaha OPL3
External Audio Inputs Microphone (Monaural), Stereo Line-In
Internal Audio Inputs Stereo FM Synthesis, Stereo Wave Data, Stereo
CD, Monaural PC Speaker
Audio Outputs Stereo Line-Out
MIDI/Joystick MIDI In, MIDI Out, up to 4 fire buttons
ADPCM Audio Compression 4:1, 3:1, and 2:1
Sampling Rate Range 5 KHz - 44.1 KHz in 228 selectable steps
Selectable Microphone AGC Yes
Microphone Support Low-Impedance (600 Ohms) Dynamic, Electek
The Vibra 16C sound controller is configured entirely through I/O port accesses. When the system is
powered up, the hardware forces the Vibra 16C to respond to default I/O port addresses, interrupt
request (IRQ) level, and direct memory access (DMA) request and acknowledge. The following table
shows the default sound controller configurations and available programmable settings.
Parameter
Default Other Available
Base I/O Address / MPU-401 220/330 240/300
8-bit DMA Req / Ack Level 1 3
16-bit DMA Req / Ack Level 5 7
Interrupt Request Level 10 5, 7
The settings above may be changed in AMIBIOS Setup (see “Chipset Setup” in the Setup and
Maintenance Guide, delivered with the system) so the Vibra 16C internal registers respond to custom
settings.