IBM 770 manual Modem Subsystem, ThinkPad Modem, MIDI Port Function, Sound Blaster Support Function

Modem Subsystem

The	modem	subsystem		is composed of	a digital	signal processor
(DSP) and		a	data access arrangement		(DAA):
Ÿ	General		MIDI-compatible, 32-voice		wave table	synthesizer
Ÿ	36.6-kbps		data/fax	modem

ŸFull-feature telephone

ŸAnswering machine

ŸHeadphone-free, full-duplex speaker phone

ThinkPad Modem

The modem subsystem provides three system settings: I/O address, IRQ level, and DMA channel.

I/O Address	IRQ Level		DMA	Channel
0130–013F (default)	IRQ	3	DMA	0
0350–035F	IRQ	4	DMA	1
0770–077F	IRQ	5	DMA	6
0DB0–0DBF	IRQ	7	DMA	7	(default)
	IRQ	10	(default)
	IRQ	11
	IRQ	15

MIDI Port Function

The MIDI port function provides one system setting:

I/O Address

0300–0303

0310–0313

0320–0323

0330–0333 (default)

Sound Blaster Support Function

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

Subsystems 3-5