<s>
The	O
MC6847	B-General_Concept
is	O
a	O
video	O
display	O
generator	O
(	O
VDG	O
)	O
first	O
introduced	O
by	O
Motorola	O
and	O
used	O
in	O
the	O
TRS-80	B-Device
Color	I-Device
Computer	I-Device
,	O
Dragon	B-Device
32/64	I-Device
,	O
Laser	B-Device
200	I-Device
,	O
TRS-80	O
MC-10/Matra	O
Alice	O
,	O
NEC	B-Device
PC-6000	I-Device
series	I-Device
,	O
Acorn	B-Device
Atom	I-Device
,	O
and	O
the	O
APF	B-Device
Imagination	I-Device
Machine	I-Device
,	O
among	O
others	O
.	O
</s>
<s>
It	O
is	O
capable	O
of	O
displaying	O
alphanumeric	O
text	O
,	O
semigraphics	B-Data_Structure
and	O
raster	O
graphics	O
contained	O
within	O
a	O
roughly	O
square	O
display	O
matrix	O
256	O
pixels	O
wide	O
by	O
192	O
lines	O
high	O
.	O
</s>
<s>
The	O
ROM	O
includes	O
a	O
5	O
x	O
7	O
pixel	O
font	O
,	O
compatible	O
with	O
6-bit	O
ASCII	B-Protocol
.	O
</s>
<s>
Effects	O
such	O
as	O
inverse	B-General_Concept
video	I-General_Concept
or	O
colored	O
text	O
(	O
green	O
on	O
dark	O
green	O
;	O
orange	O
on	O
dark	O
orange	O
)	O
are	O
possible	O
.	O
</s>
<s>
According	O
to	O
the	O
MC6847	B-General_Concept
datasheet	O
,	O
the	O
colors	O
are	O
formed	O
by	O
the	O
combination	O
of	O
three	O
signals	O
:	O
with	O
6	O
possible	O
levels	O
,	O
(	O
or	O
with	O
3	O
possible	O
levels	O
)	O
and	O
(	O
or	O
with	O
3	O
possible	O
levels	O
)	O
,	O
based	O
on	O
the	O
YPbPr	O
colorspace	B-Algorithm
,	O
and	O
then	O
converted	O
for	O
output	O
into	O
a	O
NTSC	O
analog	O
signal	O
.	O
</s>
<s>
According	O
to	O
the	O
MC6847	B-General_Concept
datasheet	O
,	O
colors	O
are	O
formed	O
by	O
the	O
combination	O
of	O
three	O
signals	O
:	O
luminance	O
,	O
chroma	O
and	O
chroma	O
,	O
according	O
to	O
the	O
YPbPr	O
color	B-Algorithm
space	I-Algorithm
.	O
</s>
<s>
1	O
)	O
The	O
colors	O
shown	O
are	O
adjusted	O
for	O
maximum	O
brightness	O
and	O
only	O
approximate	O
(	O
different	O
color	B-Algorithm
spaces	I-Algorithm
are	O
used	O
on	O
TV	O
-	O
BT601	O
and	O
web	O
pages	O
-	O
sRGB	O
)	O
.	O
</s>
<s>
2	O
)	O
At	O
least	O
on	O
the	O
Color	B-Device
Computer	I-Device
1	O
and	O
2	O
,	O
the	O
alternate	O
palette	O
of	O
text	O
modes	O
(	O
actually	O
the	O
text	O
portion	O
of	O
semigraphic	B-Data_Structure
modes	O
)	O
was	O
dark	O
pink	O
(	O
or	O
dark	O
red	O
)	O
on	O
light	O
pink	O
,	O
of	O
shades	O
not	O
listed	O
here	O
(	O
and	O
no	O
dark	O
orange	O
)	O
,	O
whereas	O
the	O
Color	B-Device
Computer	I-Device
3	O
,	O
with	O
a	O
different	O
chip	O
,	O
made	O
it	O
dark	O
orange	O
on	O
orange	O
.	O
</s>
<s>
Possible	O
MC6847	B-General_Concept
video	O
display	O
modes	O
:	O
</s>
<s>
The	O
built-in	O
character	O
generator	O
ROM	O
offers	O
64	O
ASCII	B-Protocol
characters	I-Protocol
with	O
5x7	O
pixels	O
.	O
</s>
