ISA(4) | Device Drivers Manual | ISA(4)

# NAME

`isa`, `isadma` — introduction to ISA bus support

# SYNOPSIS

`# amd64 and i386`
`isa* at amdpcib?`
`isa0 at tcpcib?`
`isa0 at mainbus0`
`isa0 at pcib?`
`isadma0 at isa?`

`# i386`
`isa0 at ichpcib?`
`isa* at glxpcib?`
`isa0 at gscpcib?`

`# alpha`
`isa* at pceb?`
`isa* at sio?`
`isadma0 at isa?`

`# loongson`
`isa* at glxpcib?`

# DESCRIPTION

The system includes a machine-independent ISA bus subsystem and several machine-independent ISA device drivers.

Attachments are machine-dependent and depend on the bus topology and ISA bus interface of the system. Drivers able to use DMA attach at `isadma`; otherwise they attach at `isa`.

Note that interrupt mappings on the i386 may require that the BIOS be configured to reserve the interrupts for these devices as "Legacy ISA". If such configuration is not done, the system may use those interrupts for pci(4) or isapnp(4) devices instead.

OpenBSD provides support for the following devices. Note that not all architectures support all devices.

## SCSI controllers

ahc(4)
  Adaptec VL/EISA/PCI SCSI interface
aic(4)
  Adaptec AIC-6260 and AIC-6360 SCSI interface
uha(4)
  Ultrastor SCSI interface
wds(4)
  WD7000 compatible ISA SCSI interface

## Disk and tape controllers

fdc(4)
  NEC765 compatible floppy disk driver
wdc(4)
  Standard Western Digital type hard drive controllers: MFM, RLL, ESDI, and IDE/ATAPI. See also the pciide(4) device driver which is used instead on machines with PCI IDE controllers.

## Serial and parallel interfaces

addcom(4)
  Addonics FlexPort 8S serial communication cards
ast(4)
  multiplexing serial communications interface
boca(4)
  multiplexing serial communications interface
com(4)
  serial communications interface
cy(4)
  Cyclades Cyclom-{4, 8, 16}Y asynchronous comms board device driver
hsq(4)
  multiplexing serial communications interface
lpt(4)
  parallel port driver

## Network interfaces

ec(4)
  3Com EtherLink II (3c503) Ethernet device
ef(4)
  3Com Fast EtherLink ISA (3c515) 10/100 Ethernet device
eg(4)
  3Com EtherLink Plus Ethernet (3c505) Ethernet device
el(4)
  3Com EtherLink (3C501) Ethernet device
ep(4)
  3Com EtherLink III and Fast EtherLink III 10/100 Ethernet device
ex(4)
  Intel EtherExpress Pro/10 and Pro/10+ Ethernet device
ie(4)
  Intel i82586/i82596 Ethernet device
lc(4)
  DEC EtherWORKS III 10/100 Ethernet device
le(4)
  AMD LANCE Ethernet device
ne(4)
  NE2000 and compatible 10/100 Ethernet device
sm(4)
  SMC91C9x and SMC91C1xx-based 10/100 Ethernet device
we(4)
  Western Digital/SMC WD80x3, SMC Elite Ultra, and SMC EtherEZ Ethernet device

## Sound cards

ess(4)
  ESS Technology AudioDrive family audio device
gus(4)
  Gravis UltraSound/UltraSound MAX audio device
mpu(4)
  Roland/Yamaha MPU401 MIDI UART device
pas(4)
  Media Vision Pro AudioSpectrum audio device
sb(4)
  SoundBlaster family audio device

## Hardware Sensors

aps(4)
  ThinkPad Active Protection System accelerometer
asmc(4)
  Apple System Management Controller (SMC)
fins(4)
  Fintek F71805F LPC Super I/O
it(4)
  ITE IT87xxF and SiS SiS950 temperature, voltage, and fan sensor with watchdog timer
lm(4)
  National Semiconductor LM78/79/81 temperature, voltage, and fan sensor
nsclpcsio(4)
  National Semiconductor PC87366 LPC Super I/O with GPIO
schsio(4)
  SMSC SCH311x LPC Super I/O
uguru(4)
  ABIT temperature, voltage and fan sensors
viasio(4)
  VIA VT1211 LPC Super I/O
wbsio(4)
  Winbond LPC Super I/O

## Miscellaneous devices

gscsio(4)
  National Semiconductor Geode SC1100 I2C controller
isagpio(4)
  ISA I/O mapped as GPIO
joy(4)
  games adapter
lms(4)
  Logitech-style bus mouse driver
mms(4)
  Microsoft-style bus mouse driver
npx(4)
  Numeric Processing Extension coprocessor and emulator
pcdisplay(4)
  PC display adapter driver for wscons
pcic(4)
  ISA PCMCIA controllers
pckbc(4)
  PC (ISA) keyboard controller driver
pcppi(4)
  PC (ISA) control and timer port driver
skgpio(4)
  Soekris net6501 GPIO and LEDs driver
tcic(4)
  Databook PCMCIA controller driver
vga(4)
  VGA graphics driver for wscons
ykbec(4)
  Ene Technology KB3310B embedded controller chip

Note that some ISA devices also have newer ISA Plug-and-Play variants. These are listed in isapnp(4).

# SEE ALSO

intro(4), isapnp(4)

# HISTORY

The machine-independent ISA subsystem appeared in OpenBSD 2.0.

April 27, 2023 | Debian