netbsd man page for attimer

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 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