<s>
Video	B-Device
BIOS	I-Device
is	O
the	O
BIOS	B-Operating_System
of	O
a	O
graphics	B-Device
card	I-Device
in	O
a	O
(	O
usually	O
IBM	O
PC-derived	O
)	O
computer	O
.	O
</s>
<s>
It	O
initializes	O
the	O
graphics	B-Device
card	I-Device
at	O
the	O
computer	O
's	O
boot	B-Operating_System
time	I-Operating_System
.	O
</s>
<s>
It	O
also	O
implements	O
INT	B-Device
10h	I-Device
interrupt	O
and	O
VESA	B-Device
BIOS	I-Device
Extensions	I-Device
(	O
VBE	B-Device
)	O
for	O
basic	O
text	O
and	O
videomode	O
output	O
before	O
a	O
specific	O
video	O
driver	O
is	O
loaded	O
.	O
</s>
<s>
In	O
UEFI	B-Architecture
2.x	O
systems	O
,	O
the	O
INT	B-Device
10h	I-Device
and	O
the	O
VBE	B-Device
are	O
replaced	O
by	O
the	O
UEFI	B-Architecture
GOP	O
.	O
</s>
<s>
Much	O
the	O
way	O
the	O
system	B-Operating_System
BIOS	I-Operating_System
provides	O
a	O
set	O
of	O
functions	O
that	O
are	O
used	O
by	O
software	O
programs	O
to	O
access	O
the	O
system	O
hardware	O
,	O
the	O
video	B-Device
BIOS	I-Device
provides	O
a	O
set	O
of	O
video-related	O
functions	O
that	O
are	O
used	O
by	O
programs	O
to	O
access	O
the	O
video	O
hardware	O
as	O
well	O
as	O
storing	O
vendor-specific	O
settings	O
such	O
as	O
card	O
name	O
,	O
clock	O
frequencies	O
,	O
VRAM	O
types	O
&	O
voltages	O
.	O
</s>
<s>
The	O
video	B-Device
BIOS	I-Device
interfaces	O
software	O
to	O
the	O
video	O
chipset	B-Device
in	O
the	O
same	O
way	O
that	O
the	O
system	B-Operating_System
BIOS	I-Operating_System
does	O
for	O
the	O
system	O
chipset	B-Device
.	O
</s>
<s>
The	O
ROM	O
also	O
contained	O
a	O
basic	O
font	O
set	O
to	O
upload	O
to	O
the	O
video	B-Device
adapter	I-Device
font	O
RAM	O
,	O
if	O
the	O
video	B-Device
card	I-Device
did	O
not	O
contain	O
a	O
font	O
ROM	O
with	O
this	O
font	O
set	O
instead	O
.	O
</s>
<s>
Unlike	O
some	O
other	O
hardware	O
components	O
,	O
the	O
video	B-Device
card	I-Device
usually	O
needs	O
to	O
be	O
active	O
very	O
early	O
during	O
the	O
boot	B-Operating_System
process	I-Operating_System
so	O
that	O
the	O
user	O
can	O
see	O
what	O
is	O
going	O
on	O
.	O
</s>
<s>
This	O
requires	O
the	O
card	O
to	O
be	O
activated	O
before	O
any	O
operating	B-General_Concept
system	I-General_Concept
begins	O
loading	O
;	O
thus	O
it	O
needs	O
to	O
be	O
activated	O
by	O
the	O
BIOS	B-Operating_System
,	O
the	O
only	O
software	O
that	O
is	O
present	O
at	O
this	O
early	O
stage	O
.	O
</s>
<s>
The	O
system	B-Operating_System
BIOS	I-Operating_System
loads	O
the	O
video	B-Device
BIOS	I-Device
from	O
the	O
card	O
's	O
ROM	O
into	O
system	O
RAM	O
and	O
transfers	O
control	O
to	O
it	O
early	O
in	O
the	O
boot	B-Operating_System
sequence	I-Operating_System
.	O
</s>
<s>
Early	O
PCs	O
contained	O
functions	O
for	O
driving	O
MDA	B-Device
and	O
CGA	B-Device
cards	O
in	O
the	O
system	B-Operating_System
BIOS	I-Operating_System
,	O
and	O
those	O
cards	O
did	O
not	O
have	O
any	O
Video	B-Device
BIOS	I-Device
built	O
in	O
.	O
</s>
<s>
When	O
the	O
EGA	B-Device
card	O
was	O
first	O
sold	O
in	O
1984	O
,	O
the	O
Video	B-Device
BIOS	I-Device
was	O
introduced	O
to	O
make	O
these	O
cards	O
compatible	O
with	O
existing	O
PCs	O
whose	O
BIOS	B-Operating_System
did	O
not	O
know	O
how	O
to	O
drive	O
an	O
EGA	B-Device
card	O
.	O
</s>
<s>
Ever	O
since	O
,	O
EGA/VGA	O
and	O
all	O
enhanced	O
VGA	B-Protocol
compatible	O
cards	O
have	O
included	O
a	O
Video	B-Device
BIOS	I-Device
.	O
</s>
<s>
When	O
the	O
computer	O
is	O
started	O
,	O
some	O
graphics	B-Device
cards	I-Device
(	O
usually	O
certain	O
Nvidia	O
cards	O
)	O
display	O
their	O
vendor	O
,	O
model	O
,	O
Video	B-Device
BIOS	I-Device
version	O
and	O
amount	O
of	O
video	O
memory	O
.	O
</s>
<s>
Up	O
until	O
the	O
mid	O
2010s	O
,	O
video	O
ROMs	O
were	O
user-editable/modifiable	O
,	O
which	O
allowed	O
users	O
to	O
configure	O
GPU	B-Architecture
features	O
like	O
core	O
clocks	O
,	O
VRAM	O
clocks	O
or	O
fan	O
speed	O
curves	O
.	O
</s>
<s>
In	O
certain	O
cases	O
,	O
a	O
different	O
GPU	B-Architecture
class	O
could	O
have	O
been	O
unlocked	O
.	O
</s>
<s>
Older	O
NVIDIA	O
GPU	B-Architecture
ROMs	O
up	O
until	O
the	O
GeForce	O
900	O
series	O
could	O
be	O
edited	O
using	O
NiBiTor	O
(	O
NVIDIA	O
BIOS	B-Operating_System
Editor	O
)	O
.	O
</s>
