| PCPPI(4) | Device Drivers Manual | PCPPI(4) | 
pcppi —
pcppi* at acpi?
pcppi* at isa?
isabeep* at pcppi? (alpha only)
sysbeep* at pcppi? (i386 only)
spkr0 at pcppi?
midi* at pcppi?
pcppi driver handles resource allocation and device
  attachment for the ports related to the ISA speaker in the traditional PC/AT
  “design”. 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.
When associated with an
    attimer(4) device, it is
    possible to change the pitch of the sounds emitted through
    pcppi.
The pcppi driver provides its child
    devices with the ability to output simple tones through the PC speaker. The
    speaker(4) and
    midi(4) devices use this to
    synthesize sounds. The
    isabeep(4) and
    sysbeep(4) devices are
    helpers which the pckbd(4)
    driver uses as a substitute for a “keyboard beep”, because the
    PC keyboard hardware doesn't provide this.
| March 22, 2005 | NetBSD 10.1 |