Designating The Soft Character Set - Digital Equipment VT520 Programming Manual

Character Sets
7.6 Soft Character Sets
You can adjust the screen size by using the select number of lines/screen
(DECSNLS) control function. The terminal automatically selects the appropriate
soft set for the screen size.
When loading a soft set, you specify which of the six width/height variations
the set is intended for. Your set replaces any soft set already loaded for that
width/height variation.
You should load six variations of your set to correspond to the six variations
of character width and height available in the terminal (80 or 132 columns by
24, 36, or 48 lines). Do not confuse the font rendition with the actual character
set. You cannot load six different soft sets. However, you can load six different
renditions of the same soft set.

7.6.4 Designating the Soft Character Set

You designate your soft character set the same way you designate the hard
character sets—using a select character set (SCS) sequence. You also use the
same format for the SCS sequence.
Intermediate(s)
are one or more characters that designate the soft character set as one of the
logical sets, G0 through G3. You use the same intermediate characters that you
use for SCS select character set function (Table 5–13).
The intermediate character(s) also indicates whether the soft character set is
a 94- or 96-character set. Make sure you use an intermediate character that
matches the setting of the character set size parameter (Pcss) in the DECDLD
string (Table 5–2).
Final
is the Dscs name you used for the soft character set in the DECDLD string.
Notes on Designating Soft Character Sets
• Replacing a soft set with a new soft set
If you use a new Dscs name when you replace the current soft set with
another soft set, then the following occurs:
– Characters from the old soft set are undefined. If you redefine the soft
set, characters currently on the screen may change.
– Any logical sets (G0, G1, G2, G3) used to designate the old soft set are
undefined. The in-use table is also undefined.
After you load a new soft set, use a select character set (SCS) sequence to
designate the soft set. Using SCS eliminates the confusion involved with
undefined characters.
• Replacing a hard set with a soft set
You can define a soft set that replaces one of the hard sets (such as ASCII or
DEC Special Graphic).
7–14 Character Sets
ESC Intermediate(s)
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Final
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