<s>
The	O
Mullard	B-General_Concept
SAA5050	I-General_Concept
was	O
a	O
character	O
generator	O
chip	O
for	O
implementing	O
the	O
Teletext	O
character	B-General_Concept
set	I-General_Concept
.	O
</s>
<s>
The	O
SAA5050	B-General_Concept
was	O
used	O
in	O
teletext-equipped	O
television	O
sets	O
,	O
viewdata	B-Application
terminals	O
,	O
and	O
microcomputers	B-Architecture
,	O
most	O
notably	O
on	O
computers	O
like	O
the	O
Philips	B-Device
P2000	I-Device
(	O
1980	O
)	O
,	O
Acorn	B-Device
System	I-Device
2	I-Device
(	O
1980	O
)	O
,	O
BBC	B-Device
Micro	I-Device
(	O
1982	O
)	O
,	O
Malzak	O
and	O
the	O
Poly-1	O
.	O
</s>
<s>
The	O
chip	O
generated	O
appropriate	O
video	O
output	O
for	O
a	O
7-bit	O
input	O
character	B-General_Concept
code	I-General_Concept
representing	O
the	O
current	O
character	O
on	O
the	O
text	O
line	O
,	O
while	O
keeping	O
track	O
of	O
the	O
effect	O
of	O
any	O
of	O
the	O
various	O
control	O
characters	O
defined	O
by	O
the	O
teletext	O
standard	O
that	O
had	O
previously	O
occurred	O
in	O
that	O
text	O
line	O
,	O
which	O
could	O
be	O
used	O
to	O
change	O
the	O
foreground	O
and	O
background	O
colour	O
,	O
switch	O
to	O
or	O
from	O
the	O
alternate	O
block	O
graphics	O
character	B-General_Concept
set	I-General_Concept
,	O
or	O
various	O
other	O
effects	O
.	O
</s>
<s>
Full-screen	O
resolution	O
generated	O
by	O
the	O
SAA5050	B-General_Concept
was	O
480×500	O
pixels	O
,	O
corresponding	O
to	O
40×25	O
characters	O
.	O
</s>
<s>
The	O
pixels	O
were	O
usually	O
displayed	O
with	O
a	O
1.33:1	O
or	O
1.2:1	O
aspect	B-Device
ratio	I-Device
to	O
give	O
a	O
full	O
display	O
close	O
to	O
the	O
standard	O
4:3	O
TV	O
aspect	B-Device
ratio	I-Device
,	O
effectively	O
a	O
400×300	O
or	O
480×400	O
display	O
.	O
</s>
<s>
Compared	O
to	O
other	O
alternative	O
chips	O
,	O
the	O
SAA5050	B-General_Concept
implemented	O
the	O
original	O
World	O
System	O
Teletext	O
teletext	O
standard	O
(	O
Level	O
1	O
)	O
,	O
which	O
had	O
no	O
provision	O
to	O
set	O
black	O
for	O
the	O
foreground	O
text	O
colour	O
.	O
</s>
<s>
Some	O
alternative	O
chips	O
at	O
the	O
time	O
did	O
allow	O
this	O
,	O
as	O
became	O
formalized	O
in	O
the	O
1981	O
CEPT	B-Device
videotex	O
standard	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
UK	O
version	O
,	O
several	O
variants	O
of	O
the	O
chip	O
existed	O
with	O
slightly	O
different	O
character	B-General_Concept
sets	I-General_Concept
for	O
particular	O
localizations	O
and/or	O
languages	O
.	O
</s>
<s>
These	O
had	O
part	O
numbers	O
SAA5051	O
(	O
German	O
)	O
,	O
SAA5052	O
(	O
Swedish	O
)	O
,	O
SAA5053	O
(	O
Italian	O
)	O
,	O
SAA5054	O
(	O
Belgian	O
)	O
,	O
SAA5055	O
(	O
U.S.	O
ASCII	B-Protocol
)	O
,	O
SAA5056	O
(	O
Hebrew	O
)	O
and	O
SAA5057	O
(	O
Cyrillic	O
)	O
.	O
</s>
<s>
The	O
SAA5050	B-General_Concept
was	O
later	O
superseded	O
by	O
the	O
SAA5243	B-General_Concept
CCT	O
chip	O
,	O
integrating	O
a	O
similar	O
teletext	O
character	O
generator	O
with	O
all	O
previously	O
separately	O
implemented	O
functions	O
such	O
as	O
decoding	O
,	O
timing	O
and	O
video	O
generation	O
.	O
</s>
