Terminal Processing 9
Full-screen formatting
Full-screen formatting
The Model 204 full-screen formatting feature, described in detail in the
Model 204 User Language Manual, is designed for use with display terminals
(that is, IBM 3270 and compatible terminals). This feature allows an entire
screen to be formatted and displayed as a single entity.
When the full-screen feature is being used, the ordinary input, output, and
pausing characteristics are not in effect.
In data entry applications, the terminal user can enter input fields in response
to screen prompts and menus. Model 204 automatically validates these
entered fields according to criteria specified in the User Language request that
defines the screen. For example, the request can specify that a particular field
can contain only digits, or that a field must contain one of a set of legal codes.
The request also can control the terminal’s brightness, color, and highlighting
facilities. All User Language screen definition and manipulation statements are
discussed in the Model 204 User Language Manual.
Prerequisites
The full-screen feature is available only if the system manager sets the LFSCB
parameter (size of full-screen buffer) to a positive number during system
initialization, or if the user sets it online with the UTABLE command. Refer to
the Model 204 Parameter and Command Reference Manual for a detailed
description of the UTABLE command.
Menu feature
Two major capabilities are provided with the full-screen feature. The first full-
screen capability is the menu feature. When a menu is displayed, the user is
expected to choose from a set of numbered selection items, as in the example
below:
EMPLOYEE MENU
1. ADD EMPLOYEE
2. CHANGE ADDRESS
3. CHANGE INSURANCE
4. ADD DEPENDENT
The user does this either by indicating the appropriate number with a Program
Function (PF) key or by tabbing (using ==>|, |<==, or <==) to the desired
selection number and pressing the ENTER key. The tab key automatically
moves from one selection number to another.
Fill-in screens
The second full-screen capability supports data entry by displaying a screen to
be filled in. When such a screen is displayed to the user, it contains formatted
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