1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)dz.4 8.1 (Berkeley) 06/05/93 7.\" 8.Dd 9.Dt DZ 4 vax 10.Os BSD 4 11.Sh NAME 12.Nm dz 13.Nd 14.Tn DZ-11 15multiplexer device interface 16.Sh SYNOPSIS 17.Cd "device dz0 at uba0 csr 0160100 vector dzrint dzxint" 18.Sh DESCRIPTION 19A 20.Tn DZ-11 21provides 8 communication lines with partial modem control, 22adequate for 23.Tn UNIX 24dialup use. 25.Pp 26An optional argument 27.Ar flags 28may be supplied with the device specification 29in the config file indicating 30that the line corresponding to 31bit number 32.Ar i 33is not properly 34connected, and should be treated as hard-wired with carrier 35always present. Thus specifying 36.Ql flags 0x04 37for 38.Li dz0 39would cause line 40.Pa tty02 41to be treated in this way. 42.Pp 43Normal I/O 44control parameters for individual lines are managed by 45.Xr ioctl 2 46calls. 47Line speeds may be initiated via 48the 49.Xr ttys 5 50file, 51.Xr stty 1 52or 53.Xr ifconfig 8 54to name a few, 55see 56.Xr tty 4 . 57.Pp 58The 59.Nm dz 60driver monitors the rate of input on each board, 61and switches between the use of character-at-a-time interrupts 62and input silos. 63While the silo is enabled during periods of high-speed input, 64the driver polls for input 30 times per second. 65.Sh FILES 66.Bl -tag -width /dev/tty[0-9][0-9]xx -compact 67.It Pa /dev/tty[0-9][0-9] 68.It Pa /dev/ttyd[0-9a-f] 69dialups 70.El 71.Sh DIAGNOSTICS 72.Bl -diag 73.It dz%d: silo overflow . 74The 64 character input silo overflowed 75before it could be serviced. This can happen if a hard error occurs 76when the 77.Tn CPU 78is running with elevated priority, as the system will 79then print a message on the console with interrupts disabled. 80It is not serious. 81.El 82.Sh SEE ALSO 83.Xr stty 1 , 84.Xr tty 4 , 85.Xr ttys 5 , 86.Xr getty 8 87.Sh HISTORY 88A 89.Nm 90driver appeared in 91.At 32v . 92