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Introducing the HP 2624A
Pressing the _
and
II
keys disables the function keys
and removes the key labels from the screen.
To
reenable
them press
II, . ,
or
1lIJ.
THE DISPLAY SCREEN
The terminal's display screen consists of 26 lines (rows),
each containing 80 character positions (columns). Only the
upper 24 rows are used for displaying data. The bottom two
rows are used for displaying the function key labels and
certain control information (current cursor row and
column numbers, the characters"
I C"
when the insert char-
acter edit function is enabled, and so forth).
The terminal uses a raster scan deflection technique
similar to that used in television sets. With this technique,
the electron beam repeatedly traverses the screen in a
series of closely spaced horizontal lines, starting at the top
and working downward. Characters are formed from line
segments and dots produced by turning the beam intensity
on and off' at appropriate times.
Figure 1-3. Function Keys and Screen Labels
All of the character positions are fundamentally rec-
tangles 7 dots wide by 9 scan lines high. Four additional
scan lines beneath the 7X9 matrix are used for the de-
scender areas oflowercase characters, for underlining, and
for the blinking underscore cursor. One other dot is used on
either side for character-to-character spacing, and one scan
line is reserved at the top and bottom for row-to-row
spacing. This results in a character cell of 9 dots by 15 scan
lines replicated over the entire screen area (see figure 1-9).
Figure 1-4. Mode Selection Key Labels
AIDS
----
1&l1li_-
{
DEVICE
"_"11M
........
DEVICE
CONTROL
FUNCTION
GROUP
DEVICE
_ ......
... IM . . _
MODES
•
I
•
II
I
. -
MARGINS/
Ell . . . . . .
IIIIIIIIMIIIIII_
TABS/COL
SERVICE
.. _-- _lIB __
ENHANCE
. . . . . . 1IIfI
IBlllIBiI l1liII1II
VIDEO
DEFINE
_II1IIl1li ...
. . IiiJaIlllIll!Ml
ENHANCEMENTS
FIELDS
GROUP
MODIFY
CHAR SET
I11III_--
1IIII1III_1IIiiiI
DEFINE
........ ----
EDITS
CONFIG
---- ----
KEYS
CONFIGURATION
DATACOMM
Ell
""1!iIIII
Ii!lillllllllIBiI"
GROUP
CONFIG
TERMINAL
Ell
""1!iIIII
IIiIIi
Bill
BHiI_
CONFIG
Figure 1-5. HP 2624A Function Key Hierarchy
1-3
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