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HP 13231A DISPLAY ENHANCEMENTS
These instructions apply to the HP 13231A-201, HP
13231A-202 and HP 13231A-203 accessories as well as the
HP 13231A accessory. The HP 13231A accessory consists
of a Display Enhancement PCA, part no. 02640-60024; a
Top Plane Connector Assembly, part no. 02640-60022; and
a Connector Removal Tool, part no. 02640-00029. The HP
13231A-201, -202 and -203 accessories consist of the same
three items with the applicable ROM IC's mounted on the
Display Enhancement PCA. Install any of these acces-
sories as follows:
The alternate character sets are configured with jumpers
located on the upper right corner of the Display Enhance-
ment PCA. There are six jumpers, two for each ofthe three
possible alternate character sets. Jumpers 1 and 2 are for
alternate character set 1 (referred to as set A in the User's
Manual), jumpers 3 and 4 are for alternate character set 2
(set B in the User's Manual), jumpers 5 and 6 are for
alternate character set 3 (set C in the User's Manual).
The first jumper for each set (jumpers 1, 3, and 5) indicates
whether the set is composed of 128 (jumper in) or 64
(jumper out) characters. The second jumper for each set
(jumpers 2, 4, and 6) indicates whether the character set
data is in alphanumeric (jumper in) or microvector
(jumper out) format. A detailed description of data formats
for alternate character sets is given in the application
note: 2640 Series Character Set Generation (part number
13245-90001).
When using the three standard alternate character sets
(Math Set, Line Set and Large Character Set) the jumpers
would normally be configured as follows:
Math Set (placed in the first socket of set 1)
Jumper 1
=
Out, since only 64 characters are used.
Jumper 2
=
In, since character data is in alphanumeric
format.
Line Set (placed in the first socket of set 2)
Jumper 3
=
Out, since only 64 characters are used.
Jumper 4
=
Out, since character data is in microvector
form.
Large Character Set (placed in the first select of set 3)
Jumper 5
=
Out, since only 64 characters are used.
Jumper 6
=
Out, since character data is in microvector
form.
Installation
Note that the Math Set has been shown as alternate char-
acter set 1 (A in the User's Manual), the Line Set as
alternate 2 (B in the User's Manual), and the Large Char-
acter Set as alternate 3 (C in the User's Manual). They
could have been configured as any combination of the
three possible alternate sets. There is no requirement that
the sets be configured in any order.
NOTE
Do not confuse the 128/64 character
jumpers for alternate character sets with
the 128 character jumper for the
standard character set discussed in "64
Character Lower Case Rom."
EFFECT OF IMPROPER JUMPER PLACEMENT.
128 Characters Strapped for 64.
When a 128 character
set is used and is jumpered for 64 characters, only the first
64 characters in the set will be accessed. This will cause
the "q" character for example to access the same display
character as the "Q" character.
64 Characters Strapped for 128. Any attempt to access one
of the lower case 64 characters C'a", "q", etc.) will result in
a blank being displayed.
Alphanumeric Data Strapped as Microvector. Al-
phanumeric data strapped as microvector will normally
result in characters that are skewed or fuzzy.
Microvector Data Strapped as Alphanumeric. Microvector
data strapped as alphanumeric will display blanks for the
microvector characters.
INSTALLATION PROCEDURE
1. ( ) Using figure 7-6 and table 7-1 as a guide, check
that Display Enhancement PCA jumpers are ar-
ranged correctly for the ROM character set config-
uration. If there are no alternate character set
ROM's installed (HP 13231A), all jumpers should
be in the jumper socket.
2. ( ) Open terminal to its half open position (refer to
"Opening the Terminal").
3. ( ) Insert connector removal tool under Top Plane As-
sembly as shown in figure 7-7.
4. ( ) Remove Top Plane Assembly by pressing down on
connector removal tool handle. Retain Top Plane
Assembly for possible future use.
7-7
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