Special Characters - Control Data Cyber 170 Series Operator's Manual

command. In general, DSD fills in the rest of the command after 3 to 5 characters
have been entered. If the character entered is not within the legal range, or not
recognized as part of a legal command, it is rejected and not displayed.
Example:
To request that the error log dayfile be displayed on the left console screen, the
appropriate DSD command is A, ERROR LOG. The operator begins by typing A.
DSD checks this input but cannot recognize the command since seven other commands
also begin with the letter A. The operator then enters the comma (,). Because two
other commands also begin with these characters, DSD still cannot recognize the
command. However, when the operator enters E, the command becomes unique and
DSD fills in the remainder of the entry on the display (RROR LOG.). If the operator
does not wait for DSD to complete the command, but continues to type in the remaining
characters himself, those characters will be ignored.
DSD signals that a keyboard entry is complete by intensifying individual characters in
rotation. At this time, the operator can press the carriage return key. DSD checks the
. command and begins processing if it is found to be acceptable. If the command is
processed successfully, it is erased from the display screen. However, if DSD must
wait for a resource to become available (such as a channeI), or if the command was not
acceptable, one of the following messages is displayed above the command.·
Message
ILLEGAL ENTRY.
DISK BUSY.
PPU BUSY.
t
MTR BUSY.
t
Meaning
Command not recognized by DSD. Operator must
either correct or reenter the command.
DSD is waiting for an overlay to be loaded from a
mass storage device.
DSD is waiting for a PPU to be assigned so that it can
process a command.
DSD is waiting for a response from the system.
If such a message persists for any length of time, the operator can terminate the
entry· by pressing the left blank (erase) or BKSP (backspace) key.
SPECIAL CHARACTERS
In addition to the command entries, the following keys have special meaning to DSD
when they are entered as the first character.
Key
Action Initiated
A lternates display control between DSD and DIS
each time the key is pressed.
Alternates left screen memory display (C, D, F,
or G) between absolute locations and those relative
to a control point each time the key is pressed.
However, unless a control point memory display is
currently selected (refer to Storage Displays in
section 4) only absolute locations are displayed.
T hat is, pressing the
=
key w ill have no effect.
tIf
the message is preceded by LOG -, the command has been executed but not yet logged in
the system dayfile and/ or error log. (Refer to DSD Commands, section 3. )
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