Pcppi

PCPPI(4) - Device Drivers Manual

Pckbd, Intro, Isa, Speaker, Pcppi

PCPPI(4) - Device Drivers Manual # PCPPI(4) - Device Drivers Manual NAME # pcppi - PC (ISA) control and timer port driver SYNOPSIS # pcppi* at isa? spkr0 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 I/O address 0x61 and the first 8253 timer at 0x40-0x43. ...

SPKR(4) - Device Drivers Manual

Pcppi, Intro, Speaker

SPKR(4) - Device Drivers Manual # SPKR(4) - Device Drivers Manual NAME # speaker, spkr - console speaker device driver SYNOPSIS # spkr0 at pcppi? DESCRIPTION # The speaker device driver allows applications to control the built-in speaker on machines providing a PCPPI speaker interface. Only one process may have this device open at any given time; open(2) and close(2) are used to lock and relinquish it. An attempt to open() when another process has the device locked will return -1 with an EBUSY error indication. ...