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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