IBM 560 - Manual (Page 60)

Audio Subsystem
Sound Blaster Support Function
The Sound Blaster support function provides three system settings:
I/O address, IRQ level, and DMA channel.
Audio Port Specifications
Audio 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
Audio 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
I/O Address IRQ Level DMA Channel
0220–022F (Default)
0240–024F
0338–033F (FM synthesizer) IRQ 5 (Default)
IRQ 7
IRQ 10
IRQ 11 DMA 0
DMA 1 (Default)
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3-6 ThinkPad 560/560E Subsystems