IBM 770 User Manual
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.
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:
features:
High-quality audio (44.1-kHz MPC-2 16-bit audio)
General MIDI compatible, 32-voice wave table synthesizer
Sound Blaster support
MIDI Port Function
The MIDI port I/O address is as follows (only when docked to the
docking station):
docking station):
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, and DMA channel.
I/O Address
0300–0301
0330–0331 (default)
0330–0331 (default)
I/O Address
IRQ Level
DMA Channel
0220–022F (default)
0240–024F
0338–038B (FM synthesizer)
0240–024F
0338–038B (FM synthesizer)
IRQ 5 (default)
IRQ 7
IRQ 10
IRQ 11
IRQ 7
IRQ 10
IRQ 11
DMA 0
DMA 1 (default)
DMA 1 (default)
Subsystems 3-7