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ATTIMER(4)                   Device Drivers Manual                  ATTIMER(4)

     attimer - AT Timer (8253) driver

     attimer*  at acpi?
     attimer0  at isa?

     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.

     acpi(4), isa(4), pcppi(4)

NetBSD 10.99                    March 22, 2005                    NetBSD 10.99