<s>
The	O
character	O
sets	O
used	O
by	O
Videotex	B-Operating_System
are	O
based	O
,	O
to	O
greater	O
or	O
lesser	O
extents	O
,	O
on	O
ISO/IEC	O
2022	O
.	O
</s>
<s>
Three	O
Data	O
Syntax	O
systems	O
are	O
defined	O
by	O
ITU	O
T.101	O
,	O
corresponding	O
to	O
the	O
Videotex	B-Operating_System
systems	O
of	O
different	O
countries	O
.	O
</s>
<s>
The	O
mosaic	O
sets	O
supply	O
characters	O
for	O
use	O
in	O
semigraphics	B-Data_Structure
.	O
</s>
<s>
It	O
corresponds	O
to	O
some	O
European	O
Videotex	B-Operating_System
systems	O
such	O
as	O
CEPT	O
T/CD	O
06-01	O
.	O
</s>
<s>
0x5F	O
may	O
be	O
displayed	O
either	O
as	O
⌗	O
(	O
square	O
)	O
or	O
_	O
(	O
lower	O
bar	O
)	O
to	O
represent	O
the	O
terminator	O
function	O
required	O
by	O
Videotex	B-Operating_System
services	O
.	O
</s>
<s>
The	O
supplementary	O
set	O
for	O
Data	O
Syntax	O
3	O
is	O
based	O
on	O
an	O
older	O
version	O
of	O
T.51	O
,	O
lacking	O
the	O
non-breaking	O
space	O
,	O
soft	O
hyphen	O
,	O
not	O
sign	O
( ¬	O
)	O
and	O
broken	O
bar	O
( ¦	O
)	O
present	O
in	O
the	O
current	O
version	O
,	O
and	O
allocating	O
non-spacing	O
marks	O
for	O
a	O
"	O
vector	O
overbar	O
"	O
and	O
solidus	O
and	O
several	O
semigraphic	B-Data_Structure
characters	I-Data_Structure
to	O
unallocated	O
space	O
in	O
that	O
set	O
.	O
</s>
<s>
C0	O
control	O
codes	O
for	O
Videotex	B-Operating_System
differ	O
from	O
ASCII	O
as	O
shown	O
in	O
the	O
table	O
below	O
.	O
</s>
<s>
The	O
following	O
specialised	O
C1	O
control	O
codes	O
are	O
used	O
in	O
Videotex	B-Operating_System
.	O
</s>
