addcom - multiplexing serial communications interface
addcom0 at isa? port 0x108 irq 5
com* at addcom? slave ?
pccom* at addcom? slave ?
The addcom driver provides support for Addonics FlexPort 8/S
FlexPort 4/S) boards that multiplex together up to eight
EIA RS-232C (CCITT V.28) communications interfaces.
Each addcom device is the master device for up to eight com
kernel configuration specifies these com devices as slave
devices of the
addcom device, as shown in 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
addcom device is used to compute the base addresses for the
The port for the interrupt multiplexing register is
fixed, so it
is doubtful that more than one addcom can be used in a machine.
com(4), intro(4), isa(4)
OpenBSD support for addcom devices first appeared in OpenBSD
OpenBSD 3.6 July 16, 2001
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