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Sound Processor
The sound processor is the Ensoniq ES1371 AudioPCI processor. The ES1371 offers support
for 64 voices, and is DirectX 5.0 and ACPI compliant. The on-board ES1371 may be software
disabled if an add-in audio processor is preferred. Line-in, line-out, and Mic-in jacks are
provided on the rear of the motherboard/chassis. Integrated onto the system board, the
processor is a complete, fully-featured PC 97 compliant sound implementation. It has the
following specifications:
Feature
Specification
Audio Resolution
16-bit
MIDI/UART Mode
Compatibility
Roland MPU401
Bus Interface
16-bit PCI
CODEC
Delta Sigma-based Windows Sound System
CODEC FIFO
16 Samples
FM Synthesizer
Crystal internal FM synthesis
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
The Ensoniq ES1371 AudioPCI sound processor is configured entirely through I/O port
accesses. When the system is powered up, the hardware forces the Ensoniq ES1371 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 processor
configurations and available programmable settings.
Parameter
Default
Base I/O Address / MPU-401
220/330
8-bit Playback DMA
1
8-bit Capture DMA
3
Base IRQ / MPU IRQ
5/15
