IBM 770 Audio Subsystem, MIDI Port Function, Sound Blaster Support Function, Subsystems, MPC-2

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