Audio Subsystem - Viglen VIG556M Manual

Parallel Port
The connector for the multimode bidirectional parallel port is a 25-pin D-Sub
connector located on the back panel. In the Setup program, the parallel port can be
configured for the following:
• Compatible (standard mode).
• Bidirectional (PS/2 compatible).
• Extended Parallel Port (EPP).
• Enhanced Capabilities Port (ECP).
Floppy Controller
The I/O controller is software compatible with the N82077 floppy drive controllers
and supports both PC-AT and PS/2 modes. In the Setup program, the floppy
interface can be configured for the following floppy drive capacities and sizes:
• 360 KB, 5.25-inch
• 1.2 MB, 5.25-inch
• 720 KB, 3.5-inch
• 1.2 MB, 3.5-inch (driver required)
• 1.25/1.44 MB, 3.5-inch
• 2.88 MB, 3.5-inch
PS/2 Keyboard and Mouse Interface
PS/2 keyboard and mouse connectors are located on the back panel. The +5 V lines
to these connectors are protected with a PolySwitch circuit that, like a self-healing
fuse, re-establishes the connection after an over-current condition is removed.
The keyboard controller supports the hot-key sequence <Ctrl><Alt><Del> for a
software reset. This key sequence resets the computer's software by jumping to the
beginning of the BIOS code and running the Power-On Self Test (POST).

Audio Subsystem

The Vig556M board has multiple AC '97 V 1.03 compliant audio features including
an Analog Devices ALC 655 codec.
The audio subsystem includes these features:
• Split digital/analog architecture for improved S/N (signal-to-noise) ratio: ≥ 85dB –
measured at line out, from any analog input, including line in, CD-ROM, and
auxiliary line in.
• 3-D stereo enhancement
• Power management support for APM 1.2 and ACPI 1.0 (driver dependant)
• Audio inputs:
o Four analog line-level stereo inputs for connection from line in, CD, video
source line in and aux
o Two analog line-level inputs for speakerphone input and PC beep
o One mono microphone input
V1.0 VIG556M Motherboard Manual
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