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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
BELL ,
C
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--r!atacorn/Pr- 1 n1:er .1fWI~~~
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FORI'IAT i'IODE
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R'~C I I
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t. ,
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1
eo
arT e r m (
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Rlternate Set
rpamW'j';!;_
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Figure 1-10. 'JYpical Configuration Menu
1-5
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