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Keyboards and Character Sets
·You select the base set as the alternate character set by issuing the escape sequence:
Ec)@
The assignment ofthe 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 character set, 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 have specified an alternate character set, you access these characters by executing a
((shift-out". From the keyboard, you shift-out from the base set by simultaneously pressing 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 simultaneously pressing 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
element set. The lower 128 elements are accessed when Extended 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
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