IOAT(4) | Device Drivers Manual | IOAT(4)

# NAME

`ioat` —
multiplexing serial communications interface

# SYNOPSIS

For 6-port BOCA IOAT66 board:

`ioat0 at isa? port 0x220 irq 5`
`com2 at ioat? slave ?`
`com3 at ioat? slave ?`
`com4 at ioat? slave ?`
`com5 at ioat? slave ?`
`com6 at ioat? slave ?`
`com7 at ioat? slave ?`

# DESCRIPTION

The `ioat` driver provides support for BOCA Research IOAT66 boards that multiplex together up to six EIA RS-232C (CCITT V.28) communications interfaces.

Each `ioat` device is the master device for up to six `com` devices. The kernel configuration specifies these `com` devices as slave devices of the `ioat` device, as shown in the synopsis. The slave ID given for each `com` device determines which bit in the interrupt multiplexing register is tested to find interrupts for that device. The port specification for the `ioat` device is used to compute the base addresses for the `com` subdevices. The port for the interrupt multiplexing register is not programmable.

# FILES

/dev/tty??

# SEE ALSO

com(4)

# HISTORY

The `ioat` driver was adapted from the boca driver by Michael Richardson.

January 24, 2000 | NetBSD 9.2