---
name: "nsclpcsio"
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/nsclpcsio"
---

# nsclpcsio(4)

National Semiconductor PC87366 LPC Super I/O with GPIO

## NAME

**nsclpcsio** – National Semiconductor PC87366 LPC Super I/O with GPIO

## SYNOPSIS

**nsclpcsio\* at isa?** **gpio\* at nsclpcsio?**

## DESCRIPTION

The **nsclpcsio** driver provides support for the National Semiconductor PC87366 LPC Super I/O. The Super I/O module incorporates several logical devices, the following ones are supported: GPIO, VLM and TMS.

The GPIO logical device provides 29 I/O pins which can be accessed through the [gpio(4)](/gpio/4.md) framework. The [gpioctl(8)](/gpioctl/8.md) program allows easy manipulation of the pins from userland.

VLM and TMS logical devices provides hardware monitoring capabilities to be used with the [sysctl(8)](/sysctl/8.md) interface. The following 17 monitoring sensors are available:

| | | |
| --- | --- | --- |
| **Sensor** | **Units** | **Typical Use** |
| TSENS1 | uK | Remote diode |
| TSENS2 | uK | Remote diode |
| TNSC | uK | Local diode |
| VSENS0 | uV DC | External source |
| VSENS1 | uV DC | External source |
| VSENS2 | uV DC | External source |
| VSENS3 | uV DC | External source |
| VSENS4 | uV DC | External source |
| VSENS5 | uV DC | External source |
| VSENS6 | uV DC | External source |
| VSB | uV DC | VSB |
| VDD | uV DC | VDD |
| VBAT | uV DC | VBAT |
| AVDD | uV DC | AVDD |
| TS1 | uV DC | Thermistor |
| TS2 | uV DC | Thermistor |
| TS3 | uV DC | Thermistor |

## SEE ALSO

[gpio(4)](/gpio/4.md), [isa(4)](/isa/4.md), [gpioctl(8)](/gpioctl/8.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **nsclpcsio** driver first appeared in NetBSD 2.0, OpenBSD support was added in OpenBSD 3.5.

## AUTHORS

The **nsclpcsio** driver was written by Matthias Drochner ⟨*drochner@netbsd.org*⟩ for NetBSD and then ported to OpenBSD 3.5 by Markus Friedl ⟨*markus@openbsd.org*⟩. GPIO support was added in OpenBSD 3.6 by Alexander Yurchenko ⟨*grange@openbsd.org*⟩.