Pathway/XM System Management Manual

Configuring Clients and Requesters
Compaq NonStop™ Pathway/XM System Management Manual—426761-001
5-22
Setting the DISPLAY-PAGES Parameter for Terminal
Devices
information in the following paragraph helps you estimate the number of field-attribute
entries. The tables in the remainder of this section help you match terminal type to the
average number of field-attribute entries to determine the appropriate DISPLAY-
PAGES value. Using the appropriate DISPLAY-PAGES value allows a terminal to
achieve its highest performance level without exceeding its fixed amount of RAM.
Estimating Field-Attribute Entries
Although the actual number of field-attribute entries a screen definition contains
depends on the layout of the screen, you can estimate the number of field-attribute
entries by multiplying the number of screen fields by 2. For example, a screen with 10
input fields has approximately 20 field-attribute entries. The number of field-attribute
entries is twice the number of screen fields because the terminal also identifies the
spaces between the screen fields as fields.
Assessing Terminal Capacity
“Terminal capacity” refers to the number of field-attribute entries that a terminal can
store given a specific DISPLAY-PAGES setting. The following tables list the average
number of field-attribute entries that individual terminals can store for each value of
DISPLAY-PAGES.
Table 5-1
lists the average number of field-attribute entries a T16-6520 terminal can
store. Note that the number of pages that a T16-6520 terminal can cache is fixed at 3.
Table 5-2
lists the average number of field-attribute entries a Compaq 6526 terminal
can store.
Table 5-1. Storage Capacity of T16-6520 Terminal
DISPLAY-PAGES Value Average Number of Field-Attribute Entries per Screen
3 1920
Table 5-2. Storage Capacity of T16-6526 Terminal
DISPLAY-PAGES Value Average Number of Field-Attribute Entries per Screen
1 3265
2 1524
3 944
4 654
5 480
6 364
7 281
8 219