Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   9087 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

ATTIMER(4)		 BSD Kernel Interfaces Manual		    ATTIMER(4)

NAME
     attimer — AT Timer (8253) driver

SYNOPSIS
     attimer*  at acpi?
     attimer0  at isa?

DESCRIPTION
     The attimer driver handles the so-called AT Timer device, initially found
     as chip model 8253.  It is used as the main counter for the clock on the
     i386 port, but also offers control over the pitch of the PC speaker.

     The attimer driver currently only implements the access to the ISA regis‐
     ter “TIMER1” which controls the pitch of the PC speaker, and should be
     configured along with pcppi(4) to be of any actual use.

SEE ALSO
     acpi(4), isa(4), pcppi(4)

BSD				March 22, 2005				   BSD

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

Vote for polarhome