pcppi(4) - NetBSD Manual Pages

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PCPPI(4)                  NetBSD Programmer's Manual                  PCPPI(4)


NAME

     pcppi - PC (ISA) control and timer port driver


SYNOPSIS

     pcppi* at isa?
     spkr* at pcppi?
     midi* at pcppi?
     isabeep* at pcppi?
     (alpha only)
     sysbeep* at pcppi?
     (i386 only)


DESCRIPTION

     The pcppi driver handles ressource 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.

     It provides its child devices with the ability to output simple tones
     through the PC speaker.  speaker(4) and midi(4) are devices for their
     own.  ``isabeep /'' ``sysbeep'' is a helper device which the pckbd(4)
     driver uses as a substitute for a ``keyboard beep'' because the PC key-
     board hardware doesn't provide this.


SEE ALSO

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

NetBSD 1.5.3                    April 21, 1999                               1