isabeep(4) - NetBSD Manual Pages

PCPPI(4)                NetBSD Kernel Interfaces Manual               PCPPI(4)


NAME
pcppi -- PC (ISA) control and timer port driver
SYNOPSIS
pcppi* at isa? isabeep* at pcppi? (alpha only) sysbeep* at pcppi? (i386 only) spkr0 at pcppi? midi* 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 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(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.
SEE ALSO
isa(4), midi(4), pckbd(4), speaker(4) NetBSD 3.0.1 April 21, 1999 NetBSD 3.0.1

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