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NetBSD 6.1.5 - man page for attimer (netbsd section 4)

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 con-
     trol over the pitch of the PC speaker.

     The attimer driver currently only implements the access to the ISA register ``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


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