Apple Desktop Computer Bedienungsanleitung PDF herunterladen (Seite 28)

CHAPTER 3

Devices and Ports

28 USB Ports

This chapter describes both the built-in I/O devices and the ports for

connecting external I/O devices. Each of the following sections describes an

I/O port or device:

■ “USB Ports”

■ “Keyboard”

■ “Mouse”

■ “Hard Disk Drive”

■ “Video Display”

■ “Infrared Communication Link”

■ “Sound System”

■ “Ethernet Port”

■ “Internal Modem”

USB Ports 3

The iMac computer has two Universal Serial Bus (USB) ports that are used to

connect the keyboard and mouse as well as additional I/O devices such as

printers, scanners, and low-speed storage devices.

For more information about USB on the Macintosh computer, refer to Apple

Computer’s Mac OS USB DDK ATI Reference. Information is also available on

the World Wide Web, at:

http://developer.apple.com/dev/usb/

For full speciﬁcations of the Universal Serial Bus, refer to the USB

Implementation Forum on the World Wide Web, at:

http://www.usb.org/developers/index.html

USB Connectors 3

The USB ports use USB Type A connectors, which have four pins each. Two of

the pins are used for power and two for data. Figure 3-1 is an illustration of a

Type A port and matching connector. Table 3-1 shows the pin assignments.

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Apple Desktop Computer Bedienungsanleitung Seite 28