ATTIMER(4) | Device Drivers Manual | ATTIMER(4) |
attimer
—
attimer* at acpi?
attimer0 at isa?
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 9.4 |