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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 interrupt 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
     overflow 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
     expected 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
     occurred 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
     appeared 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
     replaced by mutex(9) functions.

     The various ttyld_*() functions should be documented.