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SECTION VIII.
OPERATOR'S CONSOLE
When the central processor is operating in the interrupt mode, the INTERRUPT indicating
push-button is illuminated exactly as on the control panel.
Pressing the INTERRUPT button
interrupts the program, provided the central processor is not already in the interrupt mode.
Activation of this control interrupts the program only once per depression, even if
it
is held down •
PERIPHERAL MODE
When the STOP indicator is extinguished and the console is not in the logging mode, the
console control circuitry allows the typewriter to be addressed by a program through a read/
write channel.
The console may then be used for typing out messages from the program or for
entering parameters into the central processor.
Except for the L key (see "Control Mode" below)
and the Carriage Return key, console keys are not effective in the peripheral mode unless the
TYPE indicator is illuminated.
CONTROL MODE
In the control mode, only certain console keys with special significance are effective, and
then only if struck in accordance with certain specific requirements.
If the STOP indicator is
illuminated and the carriage is fully returned, the space (blank), 0 through 7, A, B, P, R, and
S keys have special significance.
The L key has special significance if the carriage is returned
and the TYPE indicator is off.
The keys with special significance and the functions they perform are listed below:
A
Address insertion
P
Printing control memory contents
B
Bootstrapping
R
Performing a register dump
L
Logging
S
Executing one instruction only
Mter A, or B, or P has been struck in the control mode, only octal keys are effective until a
carriage return occurs.
Mter the octal keys or the space bar have been struck in the control
mode, no other keys are effective until a carriage return occurs.
LOGGING MODE
If the TYPE indicator is off and the carriage is returned, striking the L key causes the
console to be placed in the logging mode.
The graphic" L" is typed out, and the carriage is
automatically spaced.
The operator may then enter alphanumeric information into the console
using any of the keys, including the space bar, for as long as desired.
It
should be noted, how-
ever, that the console appears "busy" to peripheral instructions while logging operations are
being performed.
8-5
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