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Test Your Knowledge in Computers #149
Difficulty: Easy
In a 1999, Dennis Ritchie stated that Linux and the BSD operating systems were a continuation of the basis of the Unix design approach and were Unix derivatives.
True or False?
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ac97(4) [netbsd man page]

AC97(4) 						   BSD Kernel Interfaces Manual 						   AC97(4)

NAME
ac97 -- generic AC97 codec driver DESCRIPTION
AC97 codecs contain the analog-to-digital (A/D), digital-to-analog (D/A), and mixing circuitry of many modern sound cards. AC97 codecs, for the most part, do not talk to host busses like the PCI bus directly. Instead, they communicate through an interface chip, called the host controller. The Ensoniq AudioPCI 97 (see eap(4)) is an example of such a host controller. Unlike many drivers, the ac97 driver does not appear in the configuration file. Instead, the driver is automatically attached by the drivers that require it. SEE ALSO
auacer(4), auich(4), auixp(4), autri(4), auvia(4), clcs(4), clct(4), eap(4), emuxki(4), esa(4), esm(4), fms(4), neo(4), yds(4) BUGS
The ac97 driver does not keep track of the current user settings and instead relies on the hardware to do this. The ac97 driver could do more to detect mixer channels that don't work and cull them from the list. BSD
October 7, 1999 BSD

Check Out this Related Man Page

EAP(4)							   BSD Kernel Interfaces Manual 						    EAP(4)

NAME
eap -- AudioPCI audio device driver SYNOPSIS
eap* at pci? dev ? function ? audio* at audiobus? joy* at eap? midi* at eap? options EAP_USE_BOTH_DACS DESCRIPTION
The eap driver provides support for the Ensoniq AudioPCI and Creative Labs SoundBlaster PCI series of audio cards. All models based on the ES1370, ES1371, and ES1373 chips are supported. By specifying: options EAP_USE_BOTH_DACS a second audio device is attached. You can use it simply by directing audio output to it. This way it is possible for two different pro- grams to use the "same" audio device simultaneously. SEE ALSO
ac97(4), audio(4), joy(4), midi(4), pci(4) HISTORY
The eap device driver appeared in NetBSD 1.4. CAVEATS
The joystick port hardware works by emulating a legacy isa(4) joystick port, bypassing the pci(4) bus method for address allocation. This is unlikely to work on PCI busses other than the primary one. There is also a possibility for conflicts with real ISA devices because the PCI bus is probed before ISA. Use with caution. BSD
July 22, 2006 BSD

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