Operation Under Dsd Control; Console Operation Under Dsd - Control Data Cyber 170 Series Operator's Manual

OPERATION UNDER. DSD CONTROL
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The operator communicates with the operating system through the console keyboard. The
figure below shows the keyboard on a CYBER 170 Series console. The PRESENTATION
CONTROL switch, located to the right of the spacebar, allows the operator to display a left
screen display only, a right screen display only, or both left and right screen displays of
reduced size on a split screen. When in the LEFT position, only those displays referred
to in the following sections as left screen displays may appear. Only those referred to as
right screen displays appear when the switch is in the RIGH T pos ition. A split screen show-
ing both the left and right displays as requested by the operator appears when the switch is
in the middle or MAINTENANCE position.
If
a 6612 dual screen display console is used,
the requested displays appear simultaneously on the left and right screens respectively;
there is no PRESENTATION CONTROL switch on the keyboard.
Each keyboard entry to DSD is a single line usually ending with a period. As characters are
entered from the console, the accumulated entry is displayed on the lower left portion of the
left display screen. When the carriage return (CR) key is pressed, a command is examined
for legality. If acceptable, the command is processed and the keyboard entry is cleared. If
the command is not acceptable, an error message appears above the entry. The operator
can then press either the erase key (left blank key) which clears both the command entered
and the error message, or the backspace (BKSP) key which deletes only the last character
displayed. Using the BKSP key allows the operator to delete the entry to the position of the
error and enter the correction.
ERASE
LEFT~RI.HT
t======;========================V ~
PRESENTATION COI/TROL
SPACEBAR
Figure 3-1. Console Keyboard
CONSOLE OPERATION UNDER DSD
The operator uses the keyboard to initiate and control equipment assigned and job
progress. DSD processes keyboard entry of commands as follows: as the operator
types each character at the console. DSD checks the accumulated entry for a match
against the table of possible commands. When DSD has received enough characters
to recognize the command. it will automatically fill in the remaining portion of the
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