dz(4) - NetBSD Manual Pages

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DZ(4)                 NetBSD/vax Kernel Interfaces Manual                DZ(4)


NAME
dz -- DZ-11 serial multiplexer device interface
SYNOPSIS
dz0 at uba0 csr 0160100 vector dzrint dzxint
DESCRIPTION
A DZ-11 provides 8 communication lines with partial modem control, ade- quate 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 car- rier 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 mes- sage on the console with interrupts disabled. It is not serious.
SEE ALSO
stty(1), tty(4), ttys(5), getty(8)
HISTORY
A dz driver appeared in Version 32V AT&T UNIX. NetBSD 9.0 June 5, 1993 NetBSD 9.0
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