DZ

Section: Devices and Network Interfaces (4)
Updated: vax
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BSD mandoc
BSD 4  

NAME

dz - DZ-11 multiplexer device interface  

SYNOPSIS

device dz0 at uba0 csr 0160100 vector dzrint dzxint  

DESCRIPTION

A DZ-11 provides 8 communication lines with partial modem control, adequate for UNIX dialup use.

An optional argument flags may be supplied with the device specification in the config file indicating that the line corresponding to bit number i is not properly connected, and should be treated as hard-wired with carrier always present. Thus specifying `flags' 0x04 for dz0 would cause line tty02 to be treated in this way.

Normal I/O control parameters for individual lines are managed by ioctl(2) calls. Line speeds may be initiated via the ttys(5) file, stty(1) or ifconfig(8) to name a few, see tty(4).

The dz driver monitors the rate of input on each board, and switches between the use of character-at-a-time interrupts and input silos. While the silo is enabled during periods of high-speed input, the driver polls for input 30 times per second.  

FILES

/dev/tty[0-9][0-9]
/dev/ttyd[0-9a-f]
dialups

 

DIAGNOSTICS

dz%d: silo overflow
The 64 character input silo overflowed before it could be serviced. This can happen if a hard error occurs when the CPU is running with elevated priority, as the system will then print a message on the console with interrupts disabled. It is not serious.

 

SEE ALSO

stty(1), tty(4), ttys(5), getty(8)  

HISTORY

A driver appeared in AT&T System 32v .


 

Index

NAME
SYNOPSIS
DESCRIPTION
FILES
DIAGNOSTICS
SEE ALSO
HISTORY

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Time: 06:48:41 GMT, May 19, 2025