Pathway/XM System Management Manual

PXMCFG Statements and PXMCHK Utility
Compaq NonStop™ Pathway/XM System Management Manual—426761-001
10-38
SET PROGRAM
TCP stops accepting terminal input and terminates the ACCEPT statement
without changes to the working storage section. Pressing the Break key has
no effect on the TCP when the ACCEPT statement is coded without an
ESCAPE ON ABORT clause. If the TCP is not executing either of the
preceding statements, pressing the Break key has no effect on the TCP
process.
OFF
directs the TCP to ignore the Break key function.
DISPLAY-PAGES number
specifies the depth of the terminal’s screen caching. DISPLAY-PAGES
determines the maximum number of screen displays that are stored in the
terminal’s memory. If you omit this attribute, the default is used. If you specify a
value greater than the defined maximum, the defined maximum is used.
You select the appropriate DISPLAY-PAGES value based on the following
application-dependent information:
•
The maximum number of fields per screen that is declared in the SCREEN
COBOL program
•
The average number of fields per screen the terminal type can handle for the
particular setting of the DISPLAY-PAGES option
Terminal memory is divided into two separate areas: the screen image area and
the field attribute area. The DISPLAY-PAGES attribute determines how much
terminal memory is used for screen images as opposed to how much is used for
field attributes. The more memory assigned to one, the less is available to the
other. Therefore, if your application has many fields per screen, you should set
DISPLAY-PAGES to a small value to leave room for the field attributes. If you
specify too many display pages, you might receive the terminal error ALL
FIELDS USED.
Terminal Type Default Value Defined Minimum Defined Maximum
T16-6540 7 1 16*
T16-6530WP 7 1 8*
T16-6530 7 1** 8*
T16-6520 3 1** 3
IBM-3270 1 1 1
TS530 8 1 8*
* This is the absolute maximum allowed for the TCP. However, if the terminal or terminal emulator
has less memory, the working value is negotiated downward.
** Although the PATHMON process allows you to set the number of pages to 1, some terminals or
terminal emulators do not honor that setting. For example, the T16-6520 terminal always sets its
number of display pages to 3, regardless of the user setting.