Chapter 2. System Board Features
When the computer is started, the resource assignments are subject to change during POST.
Audio
The audio subsystem on the system board has a Crystal 4236 with an integrated Yamaha OPL3 FM
synthesizer. This includes a 16-bit, stereo audio subsystem that provides all the digital audio and analog
mixing functions required for recording and playing high-quality sound from IntelliStation M Pro
computers. The audio subsystem provides the following functions:
ISA bus interface
Digital audio processor that is Sound Blaster compatible and meets the requirements of Microsoft
Windows Sound System applications
Windows Sound System interface
FM synthesizer interface
16-bit codec/mixer
IntelliStation M Pro computers have a built-in, high-quality speaker and three audio jacks (ports). The
jacks are industry-standard, 3.5 mm (1/8") mini-jacks. A description of these jacks follows.
Audio Line Out: This jack, which is located on the rear connector panel, is used to send audio signals
from the computer to external devices, such as headphones, stereo-powered speakers with built-in
amplifiers, multimedia keyboards, or the Audio Line In jack on a stereo system.
Audio Line In: This jack, which is located on the rear connector panel, is used to send audio signals
from an external device (such as a CD player or stereo) to the computer so that the signals can be
recorded on the hard disk. (However, the input level must be reduced accordingly using the mixer
provided in the computer operating system.)
Microphone: This jack, which is located on the front panel, is used to connect a microphone to the
computer so that voice or other sounds can be recorded on the hard disk. This jack can also be used
by speech-recognition software.
The following table shows the system resource assignments for the audio controller.
Table 6 (Page 2 of 2). System Resource Assignments for the Real-Time Clock
Resource
Resource Assignment
RAM
None
I/O Address (Hex)
0070, bits 6—0 (address)
0071 (data)
0072—0077 (address and data)
IRQ
8
DMA
None
Table 7 (Page 1 of 2). System Resource Assignments for the Audio Controller
Resource
Resource Assignment
ROM
None
RAM
None
I/O Address (Hex)
Required
3
IRQ
Required
3
3
Assigned by Plug and Play BIOS or operating system.
Chapter 2. System Board Features
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