---
name: "ct"
section: "4"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/ct/4"
---

# ct(4)

WD33C93\[ABC\] based CBUS SCSI host adapter driver

## NAME

**ct** – WD33C93\[ABC\] based CBUS SCSI host adapter driver

## SYNOPSIS

**device ct** **device scbus**

In */boot/device.hints:*

For most PC-9801-55, -92 and compatibles: **hint.ct.0.at="isa"**

For ELECOM bus-master SCSI adapters: **hint.ct.0.at="isa"** **hint.ct.0.flags="0x30000"**

For I-O DATA SC98 adapters: **hint.ct.0.at="isa"** **hint.ct.0.flags="0x10000"**

For LOGITEC adapters: **hint.ct.0.at="isa"** **hint.ct.0.flags="0x50000"**

For TEXA adapters: **hint.ct.0.at="isa"** **hint.ct.0.flags="0x20000"**

For adapters with SMIT transfer mode to enable SMIT transfer: **hint.ct.0.at="isa"** **hint.ct.0.flags="0x40000"** **hint.ct.0.maddr="0xdc000"**

Flags meaning:

- 0x00000

  DMA transfer mode for an NEC PC-9801-55, -92 (or compatibles), ICM IF-2660, Midori-Denshi MDC-554NA, or Logitec LHA-N151

- 0x10000

  DMA transfer mode for an I-O DATA SC-98II

- 0x20000

  bus-master transfer mode for a TEXA HA-55BS2, its successors, or Midori-Denshi MDC-926R

- 0x30000

  bus-master transfer mode for an ELECOM bus-master SCSI adapter

- 0x40000

  SMIT transfer mode (for supported adapters only)

- 0x50000

  bus-master transfer mode for a Logitec LHA-20x series, ICM IF-2766, IF-2766ET, IF-2767 or IF-2769

## DESCRIPTION

The **ct** driver provides access to the SCSI bus connected to a WD33C93\[ABC\] based host adapter.

## HARDWARE

The **ct** driver supports the following adapters:

- ELECOM bus-master SCSI adapters

- I-O DATA SC-98II

- ICM IF-2660, IF-2766, IF-2766ET, IF-2767 and IF-2769

- Logitec LHA-N151 and LHA-20x series

- Midori-Denshi MDC-554NA and MDC-926R

- NEC PC-9801-55, 92 and compatibles

- SMIT transfer type SCSI host adapters

- TEXA HA-55BS2 and its later models

## SEE ALSO

[cd(4)](/cd/4.md), [ch(4)](/ch/4.md), [ctau(4)](/ctau/4.md), [da(4)](/da/4.md), [intro(4)](/intro/4.md), [sa(4)](/sa/4.md), [scsi(4)](/scsi/4.md)

## NOTES

Historically, the driver for the Cronyx Tau WAN adapters was “ct”. This device name was changed to “ctau” to avoid conflicts with this pc98 **ct** driver. The network device name for [ctau(4)](/ctau/4.md) is “ct”. Please see [ctau(4)](/ctau/4.md) for the details for that device.

## HISTORY

The **ct** device driver has been developed for NetBSD/pc98 and ported for FreeBSD. It first appeared in FreeBSD 4.4.

## AUTHORS

The **ct** driver was written by Naofumi HONDA.

This manual page was written by Noriaki MITSUNAGA ⟨non@FreeBSD.org⟩ and Hideyuki KURASHINA ⟨rushani@FreeBSD.org⟩.