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3276ns
Emulation Mode
Displays may be formatted or unformatted. An unformatted display has no defined fields. A
formatted display contains at least one defined field, which may be either protected or
unprotected. The terminal prevents you from keying data into protected fields. Since you may
enter characters into unprotected fields, they are also called
~~input"
fields.
An attribute byte defines each protected and unprotected field. A field remains defined until
the occurrence of the next attribute byte. Therefore, fields may wrap across a line or several
lines, and may wrap from the bottom to the top of the screen.
An application program issues a Start Field order to set each attribute byte. The byte con-
tains the video and field enhancements which pertain to that field. The character that
corresponds to the attribute byte appears as a blank on the display screen.
VIDEO ENHANCEMENTS
Once defined within an attribute byte, video enhancements propagate throughout their field.
The HP 2625A supports the following video enhancements:
• HIGH INTENSITY (implemented as HP's Full Bright)
• NORMAL INTENSITY (implemented as HP's Half Bright)
• NONDISPLAYABLE (implemented as HP's Security Video)
The HP 2625A does not support the SELECTOR PEN DETECTABLE video enhancement.
Instead, it supports the Cursor Selectable field enhancement and the Cursor Select
(CURSR
SEL)
key.
FIELD ENHANCEMENTS
An application program may define display fields to be:
• PROTECTED. The terminal restricts you from entering data into (or modifying the data
within) a protected field.
• UNPROTECTED. You may enter and edit characters within an unprotected field.
• NUMERIC ONLY. You may only enter the numeric digits (0 through 9), the minus sign (-),
a decimal point (.), or the DUP character within a numeric field.
• AUTO SKIP. When the Auto Skip feature is encountered, the cursor advances to the next
unprotected location.
• MODIFIED DATA TAG. The MDT bit shows whether any data within this field has been
entered, edited, or erased since the last input/output sequence.
• CURSOR SELECTABLE. This enhancement permits the Cursor Select key to function,
provided that the first character of the field is a properly defined designator character.
F-38
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