BSD 2.11 - man page for dtab (bsd section 5)
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dtab - automatic system configuration device table (2BSD)
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.
# Device Configuration Table
# Clock and console are pre-configured and should not be listed here
# Dev# Addr Vector Br Handler(s) # Comment
lp ? 177514 200 4 lpio # lp-11 line printer
ht 0 172440 224 5 htintr # tu 16 massbus tape
xp ? 176700 254 5 xpio # xp driver
dm ? 170500 310 4 dmin # dm11 dh modem control
dh ? 160020 320 5 dhin dhou # dh11 terminal mux
dz ? 160110 330 5 dzin dzdma # dz11 terminal mux
/etc/dtab device table
/Etc/dtab is unique to the PDP-11 and 2BSD.
3rd Berkeley Distribution January 22, 1987 DTAB(5)
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