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.
March 22, 2005 | NetBSD 10.99 |