User`s guide

If type-ahead input exceeds the input buffer capacity (usually 134 characters), the
terminal bell rings and RT–11 accepts no characters until a program uses part of the
type-ahead buffer, or until you delete characters. Any input typed after the terminal
bell rings is lost. Type-ahead is particularly useful when you issue multiple command
lines to system programs.
Note that after you bootstrap any RT–11 monitor, RT–11 does not recognize the
type-ahead feature until either the keyboard prompting character (.) displays or the
start-up command file begins executing. If you type ahead before this, RT–11 either
ignores or truncates your input.
If you press a single
CTRL/C
while typing ahead, RT–11 puts
CTRL/C
into the buffer.
The program currently executing exits when it makes a terminal input request.
Pressing a double
CTRL/C
returns control to the monitor immediately. If you
terminate a job by pressing
CTRL/C
twice, RT–11 discards any unprocessed type-
ahead input.
Aborting or Canceling a Command
If you change your mind about issuing a command, you can either abort or cancel
the command.
• You abort the current command that is executing by pressing
CTRL/C
twice. This
also dumps any commands in the type-ahead buffer.
• You cancel a command you are currently typing in by pressing
CTRL/C
or
CTRL/U
once.
• You exit a program that is waiting for input by pressing
CTRL/C
once.
Running Jobs in a Completely Virtual Environment
Many RT–11 commands can automatically run jobs in a completely virtual
environment. For example, the LINK, MACRO, R, and RUN commands can do
so. This often enables programs to run faster and use less low-memory space than
is otherwise required. For further information on this topic, see the SET RUN and
V/VRUN command descriptions in this manual and the Completely Virtual Mapping
Environment section in Chapter 3 of the RT–11 System Internals Manual.
How to Use DCL Commands 1–5