.TH DTAB 5
.UC
.SH NAME
dtab \- table of devices for automatic system configuration
.SH DESCRIPTION
.PP
The dtab file
contains a list of the devices that the
.I autoconfig
program will attempt to attach to the system.
.PP
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 and terminated
by a semicolon.  The fields are (in order):
.TP "\w'handler(s)  'u"
dev
The device name, usually two characters
.TP
unit
Either a unit number or a ? indicating automatic selection of unit numbers
.TP
addr
The address of the device's first register, as a 16-bit octal number
.TP
vector
The interrupt vector, in octal
.TP
BR
The priority at which the device interrupts
.TP
handler(s)
One or more routine names with which the interrupt vector is filled.
.PP
The "#" is the comment indicator and all characters from "#" to the
end of the line are ignored.
.SH EXAMPLE
.PP
Here is an example dtab file:
.nf
.sp
.dt
.ta .5i +\w'dm  ?  'u +\w'160020  'u +\w'Vector  'u +\w'5  'u +\w'dhrint dhxint   'u
#               Device Configuration Table
#    Clock and console are pre-configured and should not be listed here
#
# Dev#	Addr	Vector	Br	Handler(s)	; Comment
lp	0	177514	200	4	lpintr	; line printer
ht	0	172440	224	5	htintr	; tu 16 massbus tape
xp	?	176700	254	5	xpintr	; disk drive
dm	?	170500	300	4	dmint	; DM-11 BB DH Modem Control
dh	?	160020	310	5	dhrint dhxint	; dh11 terminal mux
dz	?	160140	340	5	dzrint dzdma	; dz11 terminal mux
.fi
.SH FILES
.ta 2i
/etc/dtab	device table
.SH SEE ALSO
autoconfig(8)