Intel D865GLC Manual - Page 23

Real-Time Clock, CMOS SRAM and Battery, I/O Controller

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The BIOS setup utility can be configured to boot firstly from either the LS120 or standard 3½ " floppy drive. Real-Time Clock, CMOS SRAM and Battery A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied. Note: If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS RAM at power-on. I/O Controller The I/O controller (SMSC LPC47M172 or National Semiconductor PC87372) provides the following features: • One serial port. • One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support • Serial IRQ interface compatible with serialised IRQ support for PCI systems PS/2-style mouse and keyboard interfaces • Interface for one 1.2 MB or 1.44 MB diskette drive • Intelligent power management, including a programmable wake-up event interface • PCI power management support • Two fan tachometer inputs • Integrated USB hub By default, the I/O controller interfaces are automatically configured during boot up. The I/O controller can also be manually configured in the Setup program. Serial Ports One 9-pin D-Sub serial port connector is located on the back panel and is compatible with NS16C550 UARTs. Parallel Port The connector for the multimode bi-directional 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). • Bi-directional (PS/2 compatible). • Extended Parallel Port (EPP). D865GLC Motherboard Manual 22

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D865GLC Motherboard Manual
22
The BIOS setup utility can be configured to boot firstly from either the LS120 or
standard 3½ “ floppy drive.
Real-Time Clock, CMOS SRAM and Battery
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years. When the computer is plugged in, the standby current from the power
supply extends the life of the battery.
The clock is accurate to ± 13 minutes/year at
25 ºC with 3.3 VSB applied.
Note:
If the battery and AC power fail, custom defaults, if previously saved, will be
loaded into CMOS RAM at power-on.
I/O Controller
The I/O controller (SMSC LPC47M172 or National Semiconductor PC87372)
provides the following features:
•
One serial port.
•
One parallel port with Extended Capabilities Port (ECP) and Enhanced
Parallel Port (EPP) support
•
Serial IRQ interface compatible with serialised IRQ support for PCI systems
PS/2-style mouse and keyboard interfaces
•
Interface for one 1.2 MB or 1.44 MB diskette drive
•
Intelligent power management, including a programmable wake-up event
interface
•
PCI power management support
•
Two fan tachometer inputs
•
Integrated USB hub
By default, the I/O controller interfaces are automatically configured during boot up.
The I/O controller can also be manually configured in the Setup program
.
Serial Ports
One 9-pin D-Sub serial port connector is located on the back panel and is compatible
with NS16C550 UARTs.
Parallel Port
The connector for the multimode bi-directional 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).
•
Bi-directional (PS/2 compatible).
•
Extended Parallel Port (EPP).