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NetBSD 6.1.5 - man page for sysbeep (netbsd section 4)

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

     pcppi -- PC (ISA) control port driver

     pcppi*   at acpi?
     pcppi*   at isa?
     isabeep* at pcppi?
     (alpha only)
     sysbeep* at pcppi?
     (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 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.

     acpi(4), attimer(4), isa(4), midi(4), pckbd(4), speaker(4)

BSD					  March 22, 2005				      BSD

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