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Hardware Devices

Some common block (character) devices are listed in Fig. 6.13 (6.14).

Figure 6.13: Some common block devices.

$\includegraphics[scale=0.7]{figures/table61.ps}$

Figure 6.14: Some common character devices.

$\includegraphics[scale=0.7]{figures/table62.ps}$
A terminal program might access a modem directly through a serial port device. Data written to or read from the devices is transmitted via the modem to a remote computer.
A program can write directly to the first virtual terminal writing data to /dev/tty1. Terminal windows running in a graphical environment, or remote login terminal sessions, are not associated with virtual terminals; instead, they're associated with pseudo-terminals.
A program can play sounds through the system's sound card by sending audio data to /dev/audio.
```
$ cat /usr/share/sndconfig/sample.au > /dev/audio
```

**Figure 6.13:** Some common block devices.
$\includegraphics[scale=0.7]{figures/table61.ps}$

**Figure 6.14:** Some common character devices.
$\includegraphics[scale=0.7]{figures/table62.ps}$

Cem Ozdogan 2007-05-16