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1.1     ! root        1: .\" Copyright (c) 1990 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" This code is derived from software contributed to Berkeley by
        !             5: .\" the Systems Programming Group of the University of Utah Computer
        !             6: .\" Science Department.
        !             7: .\"
        !             8: .\" Redistribution and use in source and binary forms are permitted provided
        !             9: .\" that: (1) source distributions retain this entire copyright notice and
        !            10: .\" comment, and (2) distributions including binaries display the following
        !            11: .\" acknowledgement:  ``This product includes software developed by the
        !            12: .\" University of California, Berkeley and its contributors'' in the
        !            13: .\" documentation or other materials provided with the distribution and in
        !            14: .\" all advertising materials mentioning features or use of this software.
        !            15: .\" Neither the name of the University nor the names of its contributors may
        !            16: .\" be used to endorse or promote products derived from this software without
        !            17: .\" specific prior written permission.
        !            18: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21: .\"
        !            22: .\"    @(#)dcl.4       5.1 (Berkeley) 6/29/90
        !            23: .\"
        !            24: .TH DCL 4 "June 29, 1990"
        !            25: .UC 7
        !            26: .SH NAME
        !            27: dcl \- HP 98628A communications link
        !            28: .SH SYNOPSIS
        !            29: .B "device             dcl0    at scode? flags 0x1"
        !            30: .SH DESCRIPTION
        !            31: The 98628A is a buffered EIA RS-232C (CCITT V.28) communications interface.
        !            32: It has one port with full modem control.
        !            33: .PP
        !            34: Each line attached to the 98628A behaves as described in
        !            35: .IR tty (4).
        !            36: Input and output for each line may set to one of following baud rates;
        !            37: 0, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
        !            38: 9600, 19200. See 
        !            39: .IR tty (4)
        !            40: for the encoding.
        !            41: .PP
        !            42: .I Flags
        !            43: should be set to 1 if the line should be treated as hard-wired with
        !            44: carrier always present, or to 0 if modem control is desired.
        !            45: .PP
        !            46: Use HP cable "98626 & 98628 opts.002, RS232-C DCE CABLE, 5061-4216" to attach non-modem devices.
        !            47: Use HP cable "98626 & 98628 opts.001, RS232-C DTE CABLE, 5061-4215" to attach modems.
        !            48: .PP
        !            49: The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts
        !            50: happen on a per character basis.
        !            51: .PP
        !            52: The high water and low water marks in the kernel tty routines are totally
        !            53: inappropriate for a device like this with a large input buffer.  Don't use
        !            54: tandem mode if possible.  A fast system can handle input at 19.2K baud without
        !            55: receive overflow.
        !            56: 
        !            57: For output to devices that make heavy use of XON/XOFF a write size of less
        !            58: then 256 will improve performance marginally.
        !            59: .SH FILES
        !            60: /dev/ttyl[0-9]
        !            61: .SH "SEE ALSO"
        !            62: tty(4)
        !            63: .SH DIAGNOSTICS
        !            64: \fBdcl%d: error 0x%x RESET CARD\fR Where the errors are in coded as
        !            65: .DS
        !            66: 0x06 card failure
        !            67: 0x0d uart receive overflow
        !            68: 0x0e receive overflow
        !            69: 0x0f missing external clock
        !            70: 0x10 cts false too long
        !            71: 0x11 lost carrier
        !            72: 0x12 activity timeout
        !            73: 0x13 connection not established
        !            74: 0x19 illegal databits/parity
        !            75: 0x1a register address out of range
        !            76: 0x1b register value out of range
        !            77: 0x-- unknown error
        !            78: .DE
        !            79: .SH BUGS
        !            80: Breaks received at a faster rate then 1 break every second will be 
        !            81: recognized as a single break.
        !            82: 
        !            83: Console use is not supported.
        !            84: 
        !            85: The RS-422/423/499, MTS-DSN/DL modes of the card are not supported.

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