---
name: "pcppi"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/pcppi"
---

# pcppi(4)

PC (ISA) control and timer port driver

## 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.

The **pcppi** driver provides its child devices with the ability to output simple tones through the PC speaker. The [speaker(4)](/speaker/4.md) device uses this to synthesize sounds. It also provides helper functions to the [pckbd(4)](/pckbd/4.md) driver as a substitute for a “keyboard beep”, because the PC keyboard hardware doesn't provide this.

## SEE ALSO

[intro(4)](/intro/4.md), [isa(4)](/isa/4.md), [pckbd(4)](/pckbd/4.md), [speaker(4)](/speaker/4.md)