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BSD 2.11 - man page for cons (bsd section 4)

CONS(4) 				       Kernel Interfaces Manual 				      CONS(4)

NAME
cons - PDP-11 console interface
DESCRIPTION
The console is available to the processor through the console registers. It acts like a normal terminal, except that typing control-P on the consoles of some PDP-11's puts the console in local console mode with an ODT (console debugger mode) prompt. The operation of the console in this mode varies per-processor. See the PDP-11 Processor Handbook for your particular processor. On an 11/44 the console can be put into local mode by typing a control-P. The ODT prompt is ``>>>''. The processor is not stopped by entering local console mode. The CPU may be halted with the ``halt'' command, which may be abbreviated to ``h.'' Conversational mode is re-entered by using the command ``c'' (continue). On 11/73 the processor's front panel halt switch must be pressed to put the console into ODT mode. The ODT prompt is an ``@''. No characters typed on the console are special while UNIX is in control of the console.
FILES
/dev/console
SEE ALSO
tty(4), reboot(8) PDP-11 Hardware Handbook specific to hardware 4th Berkeley Distribution July 27, 1987 CONS(4)


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