attimer(4) - NetBSD Manual Pages

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ATTIMER(4)              NetBSD 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)

NetBSD 4.0                      March 22, 2005                      NetBSD 4.0