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diff --git a/share/man/man4/man4.pmax/dz.4 b/share/man/man4/man4.pmax/dz.4 new file mode 100644 index 00000000000..a0e2704df95 --- /dev/null +++ b/share/man/man4/man4.pmax/dz.4 @@ -0,0 +1,122 @@ +.\" +.\" Copyright (c) 1996 Jonathan Stone. +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by Jonathan Stone. +.\" 3. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" $NetBSD: dc.4,v 1.3 1998/02/23 19:46:24 jonathan Exp $ +.\" $OpenBSD: dz.4,v 1.1 2000/09/01 08:49:57 maja Exp $ +.\" +.Dd February 20, 1998 +.Dt DZ 4 pmax +.Os +.Sh NAME +.Nm dz +.Nd +dc659, dc7085 DZ11-on-a-chip serial communications interface +.Sh SYNOPSIS +.Cd "dz0 at ioasic?" +.Cd "dz0 at mainbus" +.Cd "dz1 at mainbus" +.Cd "dz2 at mainbus" +.Sh DESCRIPTION +The +.Nm +driver provides support for Digital's dc7085 four-port serial +communications chip. +The +.Nm dz +driver supports dc7085 hardware on attached to the following +parent devices: +.Pp +.Bl -tag -width speaker -offset indent -compact +.It mainbus +baseboard device on DECstation 2100, 3100, and 5100, +and optional expansion devices on the 5100. +.It ioasic +baseboard device on DECstation 5000/200. +.It vsbus +baseboard devices on the VAXstation 2000 and 3100. +.El +.Pp +The +.Nm +device is in essence a single-chip clone of the DZ-11. +The DZ-11 hardware design severely constrains performance. +One small input silo is shared across all input ports. +The +.Nm dz +hardware does not interrupt on modem transitions; instead, +they are detected via polling. +Only two lines on a baseboard +.Nm dz +device have any modem control signals; +the other two lines are wired for a keyboard and mouse. + +On some implementations (e.g., DECstation 3100), the hardware does not +bring out modem flow-control signals to the bulkhead. Only modem +carrier transition are provided. This is adequate for Unix dialin +and dialout detection, but without hardware flow control, the +.Nm +device is prone to overruns when used for serial-line protocols. + +The DECstation 5000/200 +.Nm +hardware provides full modem control on +both bulkhead RS-232 ports and is less prone to overrun. +.Sh BUGS +The 19200 speed on all +.Nm +devices is actually implemented as 19800, +presumably for bug-compatibility with the original DZ-11. +This is a hardware feature and cannot be corrected in software. +Many serial devices at 19200 fail to interoperate with the +.Nm +at its 19800 speed setting. +.Pp +The DECstation 5000/200 can set a bit in the system register +to allow the +.Nm +to run at 38400, but this applies to all four lines and disables +the 19200 speed on all four lines. This feature is not currently supported. +.Pp +The +.Nm +driver should be merged into a single driver supporting the original +DZ-11, DZ-32, and Qbus DZV-11 and DZQ-11 clones. +.Sh HISTORY +The +.Nm +driver +first appeared in +.Bx 4.4 /pmax. This manual page first appeared in +.Nx 1.2 . +Due to a name conflict the driver was renamed from +.Nm dc +to +.Nm dz +in +.Ox 2.7 . |