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Audio
The audio interface on the VL-EPM-24 is implemented using an Integrated Device Technology,
Inc. 92HD87B1X5 Audio Codec. This interface is Intel High Definition Audio compatible.
Drivers are available for most Windows-based and Linux operating systems. To obtain the most
current versions, consult the VL-EPM-24 product support page.
The J4 main I/O connector provides the line-level stereo input and line-level stereo output
connection points. The outputs will drive most standard-powered PC speaker sets.
The following table shows the pinout of the audio connector J3 on the VL-CBR-5012 breakout
board. See Table 9 for the audio pinout on connector J4 of the motherboard.
Note:
In Windows, the rear line-in audio input is configured by default as a microphone
input. To configure it for audio input, disable the microphone boost to eliminate
audio distortion.
Expansion Buses
The VL-EPM-24 supports PC/104-Plus expansion via the PCI and/or ISA buses. Be sure to
check the requirements of your expansion card against the capabilities listed below. The VL-
EPM-24 implements an LPC to ISA bridge.
PC/104-P
LUS
PC/104-Plus and PCI-104 modules can be secured directly to the top or bottom of the VL-EPM-
24. Make sure to correctly configure the slot position jumpers on each module appropriately.
PC/104 (ISA only) modules must not be positioned between the VL-EPM-24 and any PC/104-
Plus or PCI-104 modules in the stack.
The VL-EPM-24 is compliant with revision 2.0 of the PC/104-Plus specification and can support
four bus master capable PC/104-Plus modules.
The BIOS automatically allocates I/O and memory resources. However, manual PCI Interrupt
routing is used.
VL-EPM-24 Reference Manual
Table 13: VL-CBR-5012 J3 Audio Connector Pinout
J3
Signal
Pin
Name
1
LINE_INL
2
LINE_INR
3
HDA_GND
4
LINE_OUTL
5
LINE_OUTR
6
HDA_GND
(PCI + ISA) AND PCI-104 (PCI
Interfaces and Connectors
Function
Line-In Left
Line-In Right
HDA Ground
Line-Out Left
Line-Out Right
HDA Ground
)
ONLY
37
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