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RC(4)			     Kernel Interfaces Manual			   RC(4)

NAME
     rc -- RISCom/8 multiport card

SYNOPSIS
     device isa
     device rc

DESCRIPTION
     The RISCom/8 is an eight port ISA RS-232C communications multiplexer with a
     built in RISC processor.  It uses a block of sixteen I/O ports in the range
     0x200  to 0x3f0 selectable by on-board switches or jumpers.  The block must
     be aligned on a sixteen port boundary.  The jumper-selectable hardware  in-
     terrupt  level may be set to be detected during system initialization using
     settings found in the /boot/device.hints file.

     This driver is mostly based on the Cirrus Logic CL-CD180 driver.

HARDWARE
     The rc driver provides support for the SDL Communications RISCom/8 boards.

DIAGNOSTICS
     The following driver specific error messages may be reported:

     rc%d channel%d: interrupt-level buffer overflow  An internal  buffer  over-
     flow  error has occurred on the listed channel.  The rc driver will need to
     be reloaded to correct this.

     rc%d: Bad char chan %d  The channel has obtained a bad set of characters.

     rc%d: Got extra chars chan %d  The rc driver got more characters  than  ex-
     pected on the channel shown.

     rc%d: data mismatch chan %d ptr %d (%d != %d)  Data sent from channel %d to
     the rx buffer was different then expected.

     rc%d:  channel %d command timeout, rc.c line: %d  A command timeout has oc-
     curred on the channel, the src/sys/dev/rc/rc.c file can  be  consulted  for
     more information.

SEE ALSO
     tty(1),   ttyname(3),   sio(4),   tty(4),	device.hints(5),  comcontrol(8),
     getty(8), mutex(9), splx(9)

     http://www.sdlcomm.com

HISTORY
     The rc driver first appeared in FreeBSD 2.0.5.  This manual page first  ap-
     peared in FreeBSD 5.3.

AUTHORS
     This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>.

BUGS
     The  rc  driver  code still uses the spl(9) functions.  These should be re-
     placed by mutex(9) functions.

     The various ttyld_*() functions should be documented.

FreeBSD 6.0			 March 18, 2005 			   RC(4)
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