Audio Subsystem

Audio Subsystem

The crystal audio subsystem provides

16-bit

stereo

audio with

high-quality

FM

music

synthesis using

four

operators

per

voice. It

can record, compress, and play back

voice,

sound,

and

music

with

built-in

mixer controls. It

consists

of an

embedded

microprocessor,

16-bit

stereo,

20-voice

FM

music

synthesizer

(or

18

simultaneous

4-operator voices), MIDI

 

serial

port

compatible

MPU401

UART

mode,

DMA

control,

and

ISA

bus

interface

logic.

 

 

 

 

 

 

The AudioDrive provides the computer with the following audio

 

features:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ÿ

High-quality

audio

(44.1-kHz

MPC-2

 

16-bit

audio)

 

 

 

Ÿ

General

MIDI compatible, 32-voice

wave

table

synthesizer

 

ŸSound Blaster support

MIDI Port Function

The MIDI port I/O address is as follows (only when docked to the docking station):

I/O Address

0300–0301

0330–0331 (default)

Sound Blaster Support Function

The Sound Blaster support function provides three system settings: I/O address, IRQ level, and DMA channel.

I/O Address

 

IRQ Level

 

DMA

Channel

 

 

 

 

 

 

 

 

0220–022F

(default)

IRQ

5

(default)DMA

0

 

0240–024F

 

IRQ

7

DMA

1 (default)

 

0338–038B

(FM synthesizer)

IRQ

10

 

 

 

 

 

IRQ

11

 

 

 

 

 

 

 

 

 

Subsystems 3-7

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Image 65
IBM 770 manual Audio Subsystem, MIDI Port Function, Sound Blaster Support Function, Subsystems, I/O Address, MPC-2