---
name: "ncv"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ncv/4freebsd"
---

# ncv(4freebsd)

NCR 53C500 based SCSI host adapter driver

## NAME

**ncv** – NCR 53C500 based SCSI host adapter driver

## SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

**device scbus** **device ncv**

Alternatively, to load the driver as a module at boot time, place the following line in [loader.conf(5)](/loader.conf/5.md):

```
ncv_load="YES"
```

## DESCRIPTION

The **ncv** driver provides access to the SCSI bus connected to an NCR 53C500 based PC-Card SCSI host adapter or an Adaptec AHA-2920 on the PCI bus.

## HARDWARE

The following devices are currently supported by the **ncv** driver:

- I-O DATA PCSC-DV

- KME KXLC002 (TAXAN ICD-400PN, etc.), KXLC004, and UJDCD450

- Macnica Miracle SCSI-II mPS110

- Media Intelligent MSC-110, MSC-200

- New Media Corporation BASICS SCSI

- Qlogic Fast SCSI

- RATOC REX-9530, REX-5572 (SCSI only)

## DIAGNOSTICS

The following error messages are sometimes returned:

- SCSI BUS RESET failed

  Usually returned when a failure occurs during the bus reset.

- CMD\_NOP failed

  No operation or the operation has failed.

- CMD\_NOP\|CMD\_DMA

  A failure occurred during the DMA read/write operations.

The **ncv** driver should return \[ENODEV\] when any of the previously noted failures occur.

## SEE ALSO

[cardbus(4)](/cardbus/4.md), [cd(4)](/cd/4.md), [da(4)](/da/4.md), [pccard(4)](/pccard/4.md), [sa(4)](/sa/4.md), [scsi(4)](/scsi/4.md)

## HISTORY

The **ncv** device driver has been developed for NetBSD/pc98 and ported to FreeBSD. The **ncv** driver first appeared in FreeBSD 2.2 with PAO and merged in FreeBSD 4.2.

## AUTHORS

The **ncv** driver was written by Naofumi Honda. This manual page was written by Tom Rhodes ⟨*trhodes@FreeBSD.org*⟩ and Noriaki Mitsunaga ⟨*non@FreeBSD.org*⟩.