47 lines
1.0 KiB
Groff
47 lines
1.0 KiB
Groff
.\" $NetBSD: pcppi.4,v 1.2 2000/07/05 15:45:34 msaitoh Exp $
|
|
.Dd April 21, 1999
|
|
.Os
|
|
.Dt PCPPI 4
|
|
.Sh NAME
|
|
.Nm pcppi
|
|
.Nd PC (ISA) control and timer port driver
|
|
.Sh SYNOPSIS
|
|
.Cd pcppi* at isa?
|
|
.Cd spkr* at pcppi?
|
|
.Cd midi* at pcppi?
|
|
.Cd isabeep* at pcppi?
|
|
(alpha only)
|
|
.Cd sysbeep* at pcppi?
|
|
(i386 only)
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver handles ressource allocation and device attachment for the
|
|
ports related to the ISA speaker in the traditional PC/AT
|
|
.Dq design .
|
|
These are the
|
|
.Dq system control port
|
|
(which was implemented by the 8255
|
|
.Dq PPI
|
|
in the XT, hence the name of this driver)
|
|
at IO address 0x61 and the first 8253 timer at 0x40-0x43.
|
|
.Pp
|
|
It provides its child devices with the ability to output
|
|
simple tones through the PC speaker.
|
|
.Xr speaker 4
|
|
and
|
|
.Xr midi 4
|
|
are devices for their own.
|
|
.Dq isabeep /
|
|
.Dq sysbeep
|
|
is a helper device which the
|
|
.Xr pckbd 4
|
|
driver uses as a substitute for a
|
|
.Dq keyboard beep
|
|
because the PC keyboard hardware doesn't provide this.
|
|
.Sh SEE ALSO
|
|
.Xr isa 4 ,
|
|
.Xr speaker 4 ,
|
|
.Xr midi 4 ,
|
|
.Xr pckbd 4
|