NAME

dtab − automatic system configuration device table (2BSD)

DESCRIPTION

The dtab file contains a list of the devices that the autoconfig(8) program will attempt to attach to the system.

Each line describes one device which may be present on the system; additional devices of the same type require additional lines.  The line contains at least six fields separated by white space.  Blank lines and comments can appear anywhere in the file except between fields; comments are delimited by ‘#’ and new line.  The fields are (in order):

dev The device name, usually two characters

unit Either a unit number or a ‘?’ indicating automatic selection of unit numbers. 

addr The address of the device’s first register, as a 16-bit octal number. 

vector The interrupt vector, in octal. 

BR The priority at which the device interrupts. 

handler(s) One or more routine names with which the interrupt vector is filled. 

EXAMPLE

#               Device Configuration Table
#    Clock and console are pre-configured and should not be listed here
#
# Dev#AddrVectorBrHandler(s)# Comment
lp?1775142004lpio# lp-11 line printer
ht01724402245htintr# tu 16 massbus tape
xp?1767002545xpio# xp driver
dm?1705003104dmin# dm11 dh modem control
dh?1600203205dhin dhou# dh11 terminal mux
dz?1601103305dzin dzdma# dz11 terminal mux

FILES

/etc/dtabdevice table

SEE ALSO

autoconfig(8)

BUGS

/Etc/dtab is unique to the PDP-11 and 2BSD. 

2nd Berkeley Distribution  —  January 22, 1987