Legend 100CD  (250-0407)       Audio Features          Faxback Doc. # 15021

16-Bit and 8-bit Stereo Digital Sound Recording and Playback.

    Interrupt driven 16-bit/8-bit DMA or Programmed I/O Transfer Mode.

    Selectable Sampling Rate from 4 kHz to 48 kHz.

    Dynamic range exceeds 80dB with digital interpolation filter.

    Auto Dynamic filtering programmable according to sampling rate.

    8-bit hardware ADPCM decompression (2:1, 2.6:1, and 4:1).

    8-bit u-law and 8-bit A-law compression and decompression.

Stereo Analog/Digital Mixer

    Selectable input source with individual mute capability and volume
    control.  Mixing of various audio sources (Stereo Line-in, Stereo CD-
    Audio Input, Stereo FM music, Stereo Wave Power Synthesizer music and
    Mono Microphone-Input) for digital recording.

    Mixing of all audio sources with individual volume control (Stereo CD-
    Audio/Stereo Line-in, Stereo Digital Voice, Stereo FM Music Input,
    Stereo Wave Power Synthesizer music, Mono Microphone Input and Mono PC-
    Speaker Input).

Mixer Volume Control is adjustable by software means.

    Individual Channel volume for:

    Master Volume:               16 steps interval
    Stereo CD-Audio:             16 steps interval
    Stereo Line-in:              16 steps interval
    Stereo Digital Voice/
    Mono PC-Speaker input:       16 steps interval
    Stereo FM Synthesizer/
    Wave Table Synthesizer:      16 steps interval
    Mono Mic-in:                 16 steps interval

Stereo FM Music Synthesizer producing 20 independent stereo voices of FM
synthesized sounds with 4 FM operators (Yamaha OPL3).

Wave Table Synthesis Upgrade.

CD-ROM Drive Interfaces

    Three built-in ISA AT-Bus CD-ROM interface connectors for Panasonic,
    Mitsumi, Sony and Aztech CD-ROM drives.

MIDI Interface

    MPU401 UART mode MIDI interface or Sound Blaster Pro-compatible MIDI
    interface.

    Full duplex interface for connecting MIDI instruments (requires
    optional MIDI Kit).

    64-bytes MIDI input FIFO.

    MIDI time-stamp for Sound Blaster-compatible MIDI interface.

    Sharing the Joystick Port.

Board Configuration

    Programmable IRQ:                 2, 5, 7, 10, 11, 12, 15
    Programmable DMA:                 0, 1, 3, 5, 6, 7
    Programmable I/O Address:         530H, 320H, F40H, 220H, 240H
    Programmable CD-ROM Address:      310H, 320H, 340H, 350H
    Programmable CD-ROM IRQ:          5, 11, 12, 15
    Programmable MPU401 Address:      300H, 330H
    Programmable MPU401 IRQ:          2, 5, 7, 10

    Programmable Game Port Control

    Configuration and individual volume control settings are saved in
    EEPROM for system power up setting.

Physical Board Size

    16-Bit ISA Bus Interface card with a size of 7.1" x 4.2"

Connectors on Board

    Audio Internal:  4 pin header for CD-ROM Audio Input
                     4 pin header for MPC-Line-Out Output
                     4 pin header for PMC-Line-In Input
                     2 pin header for PC Speaker Input

    Audio External:  3.5mm Audio Jack for Microphone input.
                     3.5mm Audio Jack for Stereo Line-in.
                     3.5mm Audio Jack for Stereo Line-out.

    CD-ROM I/F Internal:  40 way header for Panasonic CD-ROM Drive
                          40 way header for Mitsumi or Aztech CD-ROM Drive
                          34 way header for Sony CD-ROM Drive

    Game Port             D-SUB 25 connector for Joystick and MIDI
                          Interface.

ELECTRICAL CHARACTERISTICS

Audio Input
   Line Input..............................................Level:  2.8 Vp-p
                                                      Impedance:  >20K Ohms
   CD-Audio Input..........................................Level:  2.8 Vp-p
                                                      Impedance:  >20k Ohms
   Mic Input:            Jumper selectable between carbon or condenser mic.
                                                   Level:  10mV to 200mVp-p
                                          Impedance:  600 ohms or >20K ohms


Audio Output
   Output Type:.................................................Line Output
   Output Level:.....................................Line output:  2.0 Vp-p
   Load Impedance:...................................Line output:  600 Ohms
   Frequency Response:...............................45Hz - 20KHz (+/- 3dB)


(ALL-04/19/95)