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Keyboard
There are 7 5 keys on the keyboard. Certain keys have a normal and an alternate
...,,,,,
function. The alternate function is selected by holding the ALT key down and
pressing the desired functional key.
In addition to alphabetic, numeric, cursor control, and keyboard control, the
following keys are provided:
•
MODE SEL/DIAG. This key is used to initiate use of the display screen for
manual operations instead of operator-to-operating system communication
(switch from system to manual mode). Activation of the mode select function
invokes a general selection display that lists the manual functions the operator
can perform. The specific mode selection display shown depends on whether
System/370 or System/370-XA mode is in effect. Activation of the DIAG
function causes a diagnostic program (the Test Case Monitor discussed in
Section 60: I 5) to be loaded into the support processor and executed.
CHG DPL Y. This key causes a switch between system and manual modes and
a switch in the display currently being shown.
CNCL (PA2). When system mode is in effect, this key causes an attention
interruption (P A2 type) to be generated for display mode operations or a unit
exception when printer-keyboard mode is in effect. The key is active only in
specific cases when manual mode is in effect.
INTR/LINE DISC. When the INTR function is selected, an external
interruption occurs. The LINE DISC function is used to terminate operation
of the Remote Support Facility or Remote Operator Console Facility.
REQ (PAl)/COMM REQ. When the REQ function is selected, an attention
interruption (PAI type) is generated for display mode. An attention
interruption without the PAI indication is generated when printer-keyboard
mode is in effect. The COMM REQ function is used to request
communication between a local and remote customer engineer when the
Remote Support Facility is active or to request communication between the
host and remote locations when the Remote Operator Console Facility is
active.
COPY. When this key is pressed, the contents of lines I through 24 of the
current display are written to the locally attached 3287 or 3268 Printer that has
been designated to receive copy-key data. This key is functional at all times.
•
START and STOP keys. These keys are used to start and stop instruction
processing.
Page up and page down keys. These keys increase and decrease addresses
during manual operations. The increment/ decrement depends on the
operation being performed.
Program function keys I to I2. These keys are effective only when the ALT
key is pressed. The function performed by each of these keys is defined via
programming.
88
A Guide to the IBM 4381 Processor
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