<s>
The	O
Multi-Color	B-Device
Graphics	I-Device
Array	I-Device
or	O
MCGA	O
is	O
a	O
video	B-Device
subsystem	I-Device
built	O
into	O
the	O
motherboard	B-Device
of	O
the	O
IBM	O
PS/2	O
Model	O
30	O
,	O
introduced	O
on	O
April	O
2	O
,	O
1987	O
,	O
and	O
Model	O
25	B-Device
,	O
introduced	O
later	O
on	O
August	O
11	O
;	O
no	O
standalone	O
MCGA	O
cards	O
were	O
ever	O
made	O
.	O
</s>
<s>
The	O
MCGA	O
supports	O
all	O
CGA	B-Device
display	I-Device
modes	O
plus	O
640×480	O
monochrome	O
at	O
a	O
refresh	O
rate	O
of	O
60Hz	O
,	O
and	O
320×200	O
with	O
256colors	O
(	O
out	O
of	O
a	O
18-bit	O
RGB	O
palette	O
of	O
262,144	O
)	O
at	O
70Hz	O
.	O
</s>
<s>
The	O
display	B-Device
adapter	I-Device
uses	O
a	O
DE-15	B-Protocol
connector	O
.	O
</s>
<s>
MCGA	O
is	O
similar	O
to	O
VGA	B-Protocol
in	O
that	O
it	O
had	O
a	O
256-color	O
mode	O
(	O
the	O
256-color	O
mode	O
in	O
VGA	B-Protocol
was	O
sometimes	O
referred	O
to	O
as	O
MCGA	O
)	O
and	O
uses	O
15-pin	O
analog	O
connectors	O
.	O
</s>
<s>
The	O
PS/2	O
chipset	O
's	O
limited	O
abilities	O
prevents	O
EGA	B-Device
compatibility	O
and	O
high-resolution	O
multi-color	O
VGA	B-Protocol
display	O
modes	O
.	O
</s>
<s>
The	O
tenure	O
of	O
MCGA	O
was	O
brief	O
;	O
the	O
PS/2	O
Model25	O
and	O
Model30	O
were	O
discontinued	O
by	O
1992	O
,	O
and	O
no	O
manufacturer	O
produced	O
a	O
clone	O
of	O
this	O
display	B-Device
adapter	I-Device
except	O
for	O
Epson	B-Device
Equity	I-Device
Ie	O
and	O
Epson	O
PSE-30	O
,	O
since	O
the	O
VGA	B-Protocol
standard	O
introduced	O
at	O
the	O
same	O
time	O
was	O
considered	O
superior	O
.	O
</s>
<s>
256-color	O
VGA	B-Protocol
games	O
ran	O
fine	O
on	O
MCGA	O
as	O
long	O
as	O
they	O
stuck	O
to	O
the	O
basic	O
320×200	O
256-color	O
mode	O
and	O
did	O
n't	O
attempt	O
to	O
use	O
VGA-specific	O
features	O
such	O
as	O
multiple	O
screen	O
pages	O
.	O
</s>
<s>
Games	O
lacking	O
support	O
for	O
256-color	O
graphics	O
were	O
forced	O
to	O
fall	O
back	O
to	O
four-color	O
CGA	B-Device
mode	O
(	O
or	O
not	O
run	O
at	O
all	O
)	O
due	O
to	O
the	O
incompatibility	O
with	O
EGA	B-Device
video	O
modes	O
(	O
320×200	O
in	O
16	O
colors	O
,	O
as	O
well	O
as	O
sometimes	O
640x200	O
or	O
640x350	O
)	O
.	O
</s>
<s>
Some	O
games	O
,	O
including	O
point-and-click	O
adventures	O
from	O
Sierra	O
On-line	O
and	O
Lucasfilm	O
Games	O
,	O
as	O
well	O
as	O
simulation	O
and	O
strategy	O
titles	O
from	O
Microprose	O
solved	O
this	O
problem	O
for	O
low-resolution	O
titles	O
by	O
supporting	O
MCGA	O
in	O
its	O
320×200	O
256-color	O
mode	O
and	O
picking	O
the	O
colors	O
most	O
resembling	O
the	O
EGA	B-Device
16-color	O
RGB	O
palette	O
,	O
while	O
leaving	O
the	O
other	O
available	O
colors	O
in	O
that	O
mode	O
unused	O
.	O
</s>
<s>
An	O
alternative	O
approach	O
used	O
by	O
a	O
small	O
number	O
of	O
(	O
generally	O
earlier	O
)	O
games	O
was	O
to	O
use	O
4-colour	O
CGA	B-Device
assets	O
but	O
make	O
use	O
of	O
the	O
adaptor	O
's	O
ability	O
to	O
freely	O
change	O
each	O
of	O
the	O
palette	O
colours	O
for	O
a	O
slightly	O
enhanced	O
appearance	O
.	O
</s>
<s>
CGA	B-Device
compatible	O
modes	O
:	O
</s>
