Within
display memory,
lines
from
the
display screen
are
stored
in
fixed-size blocks
of
6, 128, or 256 bytes.
Blank
lines
occupy 6-byte blocks,
lines
containing
120
or
fewer
displayable
characters
and
non-displaying control
bytes
occupy 128-byte blocks,
and
lines
containing
more
than
120 displayable
characters
and
non-displaying control
bytes
occupy 256-byte blocks.
If
a line
contains
fewer
than
80 displayable characters,
the
trailing
blanks
are
NOT recorded
in
display
memory
as
ASCII spaces.
For
each
line,
the
terminal
knows
where
the
displayable
portion
was
terminated
and
marks
that
point
in
the
memory
block
with
an
end-of-line
flag.
Con-
sequently, a
line
using
only
the
first
40
character
positions
for displayable
data
may
include changes of
character
sets,
video
enhancements,
and
so forth,
at
up
to 40
separate
positions
and
still
use
only 128 bytes of display memory. A
line
using
all
80
character
positions for displayable
data,
on
the
other
hand,
may
include changes of
character
sets,
video
enhancements,
and
so forth,
at
only 20
separate
positions
without
requiring
a 256-byte block of display
memory.
With
the
standard
16K
bytes,
the
HP
2624A will ac-
commodate
the
following
amount
of
data
at
any
given
time
in
display memory:
• 103
standard
lines
of
data
(128-byte blocks)
• 71
blank
lines
(6-byte blocks)
For
each
line
requiring
a 256-byte block,
subtract
1 from
103.
If
you
increase
the
data
comm buffer size,
the
additional
buffer
memory
is
obtained
from
the
RAM
that
is
allocated
for display memory. Consequently, doing so will reduce
the
number
of
blank
blocks
and
128-byte blocks available for
display memory.
Each
user-defined fUnction
key
definition also
uses
a por-
tion
of
the
RAM
that
is
allocated for display memory.
The
rules
described above
may
be
used
to
determine
how
much
memory
each
key
definition preempts.
Introducing
the
HP
2624A
The
optional
16K
bytes
of
additional
display
memory
provide you
with
an
additional 128
standard
lines
of
data
(128-byte blocks).
CONFIGURING THE TERMINAL
The
HP
2624A contains no physical
straps
or switches
(other
than
the
ON/OFF switch
on
the
rear
panel).
You
configure
the
terminal
through
the
use of configuration
menus
displayed on
the
screen.
Figure
1-10 shows a typical
configuration menu.
To
alter
the
content of a
particular
field, you use
the
tab
and
back
tab
functions to position
the
cursor
in
the
field.
If
the
field contains
an
underlined
parameter,
you change
the
value
using
the
system function
keys
(~NEXT
CHol
CE"
and
"PREVIOUS
CHDI
CE").
If
the
field
contains a non-underlined
parameter,
you merely type
in
the
desired value.
Having
filled
in
a
particular
menu, you
then
save
the
contents
ofthe
menu
in
non-volatile memory
by pressing one of
the
system
function keys
("SAVE
CoN-
FIG").
The
parameters
saved
in
non-volatile memory
are
then
used for configuring
the
terminal
whenever a
hard
reset
is performed or whenever
the
power is
turned
on.
Some
configuration
parameters
may
also
be
altered
programmatically
using
escape sequences .
THE INTEGRAL PRINTER
The
optional
integral
printer
is a fast, quiet, bidirectional
thermal
printing
unit
that
can
be used for
generating
reproducible copy from
the
terminal's
display memory or
from a
remote
computer.
The
integral
printer
can
reproduce
anything
capable of
being
displayed on
the
terminal's
screen (including
the
line
drawing, large character,
and
math
symbol sets,
all
of
the
international
language
characters,
and
the
video enhance-
ments).
TERMINAL CONFIGURATION
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Figure
1-10. 'JYpical Configuration Menu
1-5
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