pcppi - PC (ISA) control and timer port driver
pcppi* at isa?
isabeep* at pcppi? (alpha only)
sysbeep* at pcppi? (cats and i386 only)
spkr0 at pcppi?
midi* at pcppi?
The pcppi driver handles resource allocation and device attachment for
the ports related to the ISA speaker in the traditional
These are the ``system control port'' (which was implemented
by the 8255
``PPI'' in the XT, hence the name of this driver) at IO address 0x61 and
the first 8253 timer at 0x40-0x43.
The pcppi driver provides its child devices with the ability
simple tones through the PC speaker. The speaker(4) and midi(4) devices
use this to synthesize sounds. The isabeep and sysbeep devices are
helpers used by the pckbd(4) driver as a substitute for a
beep'', because the PC keyboard hardware doesn't provide
intro(4), isa(4), midi(4), pckbd(4), speaker(4)
OpenBSD 3.6 April 1, 2002
[ Back ]