IBM 560E Audio Subsystem Sound Blaster Support Function, Audio Port Specifications, Line, Channel

Audio Subsystem

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)
0338–033F	(FM synthesizer)	IRQ	10	–
		IRQ	11	–

Audio Port Specifications

ŸAudio Output:

– ⅛-inch mini-jack for headphone

– Headphone speaker output: 22 mW (32 ohm) maximum

– Maximum output level: 2.4 V pp

– Output impedance: 75 ohm

ŸAudio Input:

–	⅛-inch		mini-jack	for		microphone	or line	input
–	Microphone gain:				26	dB minimum,	48.5 dB	maximum
–	Maximum		input level:
	Microphone:		125		mV	pp
	Line	In:	4.0		V	pp
	– Input impedance:
	Microphone:		47	k	ohm
	Line	In:	30	k	ohm

3-6ThinkPad 560/560E Subsystems