Keyboards and Character Sets
·You
select
the
base
set
as
the
alternate
character
set
by issuing
the
escape sequence:
Ec)@
The
assignment
of
the
base
set
as
the
alternate
character
set
results
in
no
character
distinction
between characters displayed when
the
alternate
character
set
is
enabled
and
when
it
is
not.
To
select
the
Math
character
set
as
the
alternate
characterset, you issue
the
escape sequence:
Ec)A
To
select
the
Line
Drawing
set
as
the
alternate
character
set, you issue
the
escape sequence:
Ec)B
Once you havespecified
an
alternate
characterset, you access
these
characters
by executing a
((shift-out".
From
the
keyboard, you shift-outfrom
the
base
set
by simultaneouslypressing
the
•
and.
keys. A
running
program
may
shift-out from
the
base
set
by issuing
an
ASCII
<so>
code. Once activated, all non-control characters received from
the
keyboard or over
datacomm lines
are
displayed
as
the
selected symbols
until
one
of
the
following conditions
occurs:
•
the
base
set
is Ushifted-in" by simultaneouslypressing
the
•
and
EI keys or by receiving
an
ASCII
<si
> code over
the
datacomm line
• a previously defined video enhancement is encountered
•
the
end of
the
line is reached
When
the
Math
or Line-drawing
set
is used
in
8-bit mode,
the
terminal
interprets
it
as
a 256
elementset.
The
lower 128 elements
are
accessed whenExtended
Characters
mode is
off.
(This
is
the
default state.)
The
upper 128 elements
remain
undefined. Accessing
these
characters
through
the
keyboard
when
Extended Characters mode is on
prints
blank
characters.
NOTE: The placement
of
alternate
character
set
symbols varies,
in
part,
between
the
differ-
ent
keyboard options. The following discussions
and
illustrations
pertain
to
the
USASCII keyboard.
B-2
To Next Page
Loading...
