BSD 2.11 - man page for cons (bsd section 4)
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cons - PDP-11 console interface
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.
PDP-11 Hardware Handbook specific to hardware
4th Berkeley Distribution July 27, 1987 CONS(4)
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