Biostar 865G MICRO 775 Spécifications télécharger pdf (Page 22)

CHAPTER 3

120

All About Motherboards

Two USB

headers

FireWire

header

High-definition

audio header

S/PDIF header

Six SATA

headers

Figure 3-26 Internal connectors on a motherboard for drives and ports on the front of the case

Courtesy: Course Technology/Cengage Learning

HARDWARE CONFIGURATION

Settings on the motherboard are used to enable or disable a connector or port, set the

frequency of the CPU, system bus, or other buses, control security features, and control

what happens when the PC ﬁrst boots. In the past, conﬁguring these and other motherboard

settings was done in three different ways: DIP switches, jumpers, and CMOS RAM. Storing

conﬁguration information by physically setting DIP switches or jumpers on the motherboard

or peripheral devices was extremely inconvenient, because it often required us to open the

computer case to make a change. A more convenient method is to hold conﬁguration infor-

mation in CMOS RAM, and today’s computers store almost all conﬁguration data there. A

program in BIOS, called BIOS setup or CMOS setup, can easily make changes to the setup

values stored in CMOS RAM. Now let’s see how all three methods work.

Notes

You don’t have to replace an entire motherboard if one port fails. Most ports on a

motherboard can be disabled through BIOS setup. On older motherboards, look for jumpers or DIP

switches to disable a port. For newer boards, use BIOS setup to disable the port. Then use an expansion

card for the port instead.

motherboard. To use the ports on a module, you connect its cable to a connector on the moth-

erboard and install the module in a slot on the rear of the case intended for an expansion card.

A motherboard might have several internal connectors, including parallel ATA connectors

(also called EIDE connectors), a ﬂoppy drive connector, serial ATA connectors, SCSI

connectors, or a FireWire (IEEE 1394) connector. When you purchase a motherboard, look

in the package for the motherboard manual either printed or on CD. It will show a diagram

of the board with a description of each connector. For example, the connectors for the

motherboard in Figure 3-26 are labeled as the manual describes them. If a connector is a

group of pins sticking up on the board, the connector is called a header. You will learn to

use most of these connectors in later chapters.

A+

220-701

1.2

A+

220-701

1.2

2.5

5.2

SETUP DATA STORED BY DIP SWITCHES

Some older motherboards and expansion cards store setup data using a dual inline package

(DIP) switch, as shown in Figure 3-27. A DIP switch has an ON position and an OFF posi-

tion. ON represents binary 1 and OFF represents binary 0. If you add or remove equipment,

you can communicate that to the computer by changing a DIP switch setting. When you

change a DIP switch setting, use a pointed instrument such as a ballpoint pen to push the

switch. Don’t use a graphite pencil because graphite conducts electricity. In addition, pieces

of graphite dropped into the switch can damage it.

1435487389_ch03_CTP.qxd 7/30/09 5:22 PM Page 120

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 63 64

Commentaires sur ces manuels

Pas de commentaire

Biostar 865G MICRO 775 Spécifications Page 22

Commentaires sur ces manuels

Produits connexes et manuels pour Cartes mères Biostar 865G MICRO 775