NAME    [Toc]    [Back]

     pcppi - PC (ISA) control and timer port driver

SYNOPSIS    [Toc]    [Back]

     pcppi*   at isa?
     isabeep* at pcppi? (alpha only)
     sysbeep* at pcppi? (cats and i386 only)
     spkr0    at pcppi?
     midi*    at pcppi?

DESCRIPTION    [Toc]    [Back]

     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 IO 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) 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
``keyboard
     beep'', because the PC  keyboard  hardware  doesn't  provide
this.

SEE ALSO    [Toc]    [Back]

     intro(4), isa(4), midi(4), pckbd(4), speaker(4)

OpenBSD      3.6                           April      1,     2002