ZPWY-MAP- Definitions
NonStop Pathway/iTS Management Programming Manual—426749-002
6-9
ZPWY-MAP-DEF-PROGTERM
ZPWY-VAL-OFF. This parameter is effective only for devices running in
conversational mode.
ZDISPLAYPAGES
specifies the depth of the terminal’s screen caching. ZDISPLAYPAGES determines
the maximum number of screen displays stored in the terminal’s memory. If you do
not assign a value to this parameter, the default is used. If you specify a value
greater than the defined maximum, the defined maximum is used.
You select the appropriate value for ZDISPLAYPAGES based on the following
application-dependent information, as well as the specific terminal type:
•
The maximum number of fields per screen declared in the SCREEN COBOL
program
•
The average number of fields per screen the terminal type can handle for the
particular setting of ZDISPLAYPAGES
Terminal memory is divided into two separate areas: the screen image area and
the field attribute area. The ZDISPLAYPAGES field 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 available to the other.
Therefore, if your application has many fields per screen, you should set
ZDISPLAYPAGES to a small value to leave room for the field attributes. If the value
is too high, you might receive the terminal error ALL FIELDS USED.
For more information on how to select the appropriate value for the
ZDISPLAYPAGES field, see the Pathway System Management Manual.
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 Pathway subsystem allows you to set the number of pages to 1, some terminals or terminal
emulators do not allow that setting. For example, the T16-6520 terminal always sets its number of display
pages to 3, regardless of the user setting.
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