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PCPPI(4)                 BSD Kernel Interfaces Manual                 PCPPI(4)

NAME
     pcppi -- PC (ISA) control and timer port driver

SYNOPSIS
     pcppi*   at isa?
     spkr0    at pcppi?

DESCRIPTION
     The 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 I/O address 0x61 and
     the first 8253 timer at 0x40-0x43.

     The pcppi driver provides its child devices with the ability to output
     simple tones through the PC speaker.  The speaker(4) device uses this to
     synthesize sounds.  It also provides helper functions to the pckbd(4)
     driver as a substitute for a ``keyboard beep'', because the PC keyboard
     hardware doesn't provide this.

SEE ALSO
     intro(4), isa(4), pckbd(4), speaker(4)

BSD                             April 27, 2017                             BSD