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Introducing the HP 2624A
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Figure 1-6. User Keys Definition Menu
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Figure 1-7. Default User Key Labels
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Figure 1-8. Sample User-Supplied User Key Labels
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Two types of character sets can be stored within the ter-
minal: alphanumeric sets and microvector sets. The al-
phanumeric sets support the primary use of the terminal:
displaying textual and numeric information. Characters
are designed around a basic 7X9 dot matrix with provision
for lowercase descenders. The characters are embellished
by use of the half-shift. With this type of set, the character-
to-character spacing of two dots is hardwired. This
prevents the design of characters that would form con-
tinuous horizontal lines. All 15 scan lines of the row are,
however, available so that vertically contiguous symbol
segments can be designed. An example of this is the three-
row-high integral sign found in the math symbol set.
Microvector sets use the entire 9-dot-by-15-scan-line char-
acter cell without the half-shift. This allows characters to
be designed with both horizontal and vertical continuity.
This type of set finds its greatest application where a min-
imal set of graphic kernels is needed to represent more
complex pictorial information. The line drawing set which
can be used to display complex data entry forms on the
screen is an example of such a set.
DISPLAY MEMORY
In its standard ordering configuration, the HP 2624A in-
cludes 16K bytes of display memory. As an option, however,
you may order an additional 16K bytes.
Each displayable character uses one byte of display
memory. Each change of character set or video enhance-
ment generates a 2-byte non-displaying control sequence
which is embedded between the displayable characters in
display memory. Similarly, each format mode function
(start field, start edits, and stop field) generates a 2-byte
non-displaying control sequence. A non-displaying ter-
minator also generates a 2-byte control sequence.
Character set changes and video enhancement changes
which occur at the same character position are combined
into a single 2-byte control sequence. Similarly, "start
field" and "start edits" functions which occur at the same
character position are also combined into a single 2-byte
control sequence.
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Figure 1-9. Alphanumeric Character Generation
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