MirOS Manual: addcom(4)

ADDCOM(4)                  BSD Programmer's Manual                   ADDCOM(4)


     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 (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.




     com(4), intro(4), isa(4)


     OpenBSD support for addcom devices first appeared in OpenBSD 3.0.

MirOS BSD #10-current           July 16, 2001                                1

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