ADDCOM(4) BSD Programmer's Manual ADDCOM(4)NAMEaddcom - multiplexing serial communications interface
SYNOPSIS
addcom0 at isa? port 0x108 irq 5
com* at addcom? slave ?
or
pccom* at addcom? slave ?
DESCRIPTION
The addcom driver provides support for Addonics FlexPort 8/S (and prob-
ably FlexPort 4/S) boards that multiplex together up to eight (or four)
EIA RS-232C (CCITT V.28) communications interfaces.
Each addcom device is the master device for up to eight com devices. The
kernel configuration specifies these com devices as slave devices of the
addcom device, as shown in SYNOPSIS. The slave ID given for each com dev-
ice determines which bit in the interrupt multiplexing register is tested
to find interrupts for that device. The port specification for the addcom
device is used to compute the base addresses for the com subdevices. The
port for the interrupt multiplexing register is fixed, so it is doubtful
that more than one addcom can be used in a machine.
FILES
/dev/tty??
SEE ALSOcom(4), intro(4), isa(4)HISTORY
OpenBSD support for addcom devices first appeared in OpenBSD 3.0.
MirOS BSD #10-current July 16, 2001 1