| DZ(4) | Device Drivers Manual (vax) | DZ(4) | 
dz —
dz0 at uba0 csr 0160100 vector dzrint dzxint
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.
dz driver appeared in
  Version 32V AT&T UNIX.
| June 5, 1993 | NetBSD 9.4 |