Ess Es1788 Audiodrive - EUROCOM 6X00 Service Manual

ESS ES1788 AudioDrive

The ES1788 AudioDrive can record, compress, and playback voice, sound and music with built-
in mixer controls. It consists of an embedded microprocessor, a game compatible 16-bit stereo
A/D and D/A, music 16-bit stereo D/A, 20-voice 72 operator FM music synthesizer, MIDI serial
port compatible with MPU401 UART mode, dual joystick timers, hardware volume control, DMA
control, and ISA bus interface logic. A DSP serial interface allows an external DSP to take over
analog resources such as the D/A or A/D converters. Control of I/O address, DMA, and interrupt
selection is controlled by system software. Interface to analog inputs is extremely simple.
There are stereo inputs for CD-audio, line-in, and an external music synthesis chip or TV, and a
mono microphone input to an internal pre-amp. A digital PC speaker input is converted to an
analog signal with volume control and is available as an analog output signal. Advanced power
management features such as suspend/resume to disk, self timed power down, auto-wakeup,
and partial power-down are supported. The ES1788 AudioDrive has a 6 bit master volume
control with 64 total steps.
The ES1788 AudioDrive is compatible with Sound Blaster PRO version 3.01 voice and music
functions as documented in the Sound Blaster Series Developer Kit.
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