V1.0 VIG556M Motherboard Manual
12
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
