<s>
Amiga	B-Device
Advanced	I-Device
Graphics	I-Device
Architecture	I-Device
(	O
AGA	O
)	O
is	O
the	O
third-generation	O
Amiga	B-Device
graphic	O
chipset	O
,	O
first	O
used	O
in	O
the	O
Amiga	B-Device
4000	I-Device
in	O
1992	O
.	O
</s>
<s>
The	O
palette	O
for	O
the	O
AGA	O
chipset	O
has	O
256	O
entries	O
from	O
(	O
24-bit	O
)	O
,	O
whereas	O
previous	O
chipsets	O
,	O
the	O
Original	B-Device
Chip	I-Device
Set	I-Device
(	O
OCS	B-Device
)	O
and	O
Enhanced	B-Device
Chip	I-Device
Set	I-Device
(	O
ECS	B-Device
)	O
,	O
only	O
allow	O
out	O
of	O
4096	O
or	O
64	O
colors	O
in	O
Amiga	B-Device
Extra	O
Half-Brite	O
(	O
EHB	O
mode	O
)	O
.	O
</s>
<s>
Other	O
features	O
added	O
to	O
AGA	O
over	O
ECS	B-Device
are	O
super-hi-res	O
smooth	O
scrolling	O
and	O
32-bit	O
fast	O
page	O
memory	O
fetches	O
to	O
supply	O
the	O
graphics	O
data	O
bandwidth	O
for	O
8	O
bitplane	O
graphics	O
modes	O
and	O
wider	O
sprites	O
.	O
</s>
<s>
AGA	O
is	O
an	O
incremental	O
upgrade	O
,	O
rather	O
than	O
the	O
dramatic	O
upgrade	O
of	O
the	O
other	O
chipset	O
that	O
Commodore	O
had	O
begun	O
in	O
1988	O
,	O
the	O
Amiga	B-Device
Advanced	I-Device
Architecture	I-Device
chipset	I-Device
(	O
AAA	O
)	O
,	O
lacking	O
many	O
features	O
that	O
would	O
have	O
made	O
it	O
competitive	O
with	O
other	O
graphic	O
chipsets	O
of	O
its	O
time	O
.	O
</s>
<s>
Apart	O
from	O
the	O
graphics	O
data	O
fetches	O
,	O
AGA	O
still	O
operates	O
on	O
16-bit	O
data	O
only	O
,	O
meaning	O
that	O
significant	O
bandwidth	O
is	O
wasted	O
during	O
register	O
accesses	O
and	O
copper	O
and	O
blitter	B-General_Concept
operations	O
.	O
</s>
<s>
Also	O
the	O
lack	O
of	O
a	O
chunky	B-General_Concept
graphics	O
mode	O
is	O
a	O
speed	O
impediment	O
to	O
graphics	O
operations	O
not	O
tailored	O
for	O
planar	B-Device
modes	O
,	O
resulting	O
in	O
ghost	O
artifacts	O
during	O
the	O
common	O
productivity	O
task	O
of	O
scrolling	O
.	O
</s>
<s>
Workbench	O
in	O
256	O
colors	O
is	O
much	O
slower	O
than	O
ECS	B-Device
operation	O
modes	O
for	O
normal	O
application	O
use	O
;	O
a	O
workaround	O
is	O
to	O
use	O
multiple	O
screens	O
with	O
different	O
color	O
depths	O
.	O
</s>
<s>
These	O
missed	O
opportunities	O
in	O
the	O
AGA	O
upgrade	O
contributed	O
to	O
the	O
Amiga	B-Device
ultimately	O
losing	O
technical	O
leadership	O
in	O
the	O
area	O
of	O
multimedia	O
.	O
</s>
<s>
After	O
the	O
long-delayed	O
AAA	O
was	O
finally	O
suspended	O
,	O
AGA	O
was	O
to	O
be	O
succeeded	O
by	O
the	B-Device
Hombre	I-Device
chipset	I-Device
,	O
but	O
this	O
was	O
ultimately	O
cancelled	O
due	O
to	O
Commodore	O
's	O
bankruptcy	O
.	O
</s>
<s>
AGA	O
is	O
present	O
in	O
the	O
CD32	B-Device
,	O
Amiga	B-Application
1200	I-Application
,	O
and	O
Amiga	B-Device
4000	I-Device
.	O
</s>
<s>
In	O
order	O
to	O
increase	O
memory	O
bandwidth	O
,	O
the	O
Chip	B-Device
RAM	I-Device
data	O
bus	O
was	O
extended	O
to	O
32-bit	O
width	O
as	O
in	O
the	O
A3000	B-Device
(	O
unlike	O
AGA	O
,	O
the	O
A3000	B-Device
's	O
Chip	B-Device
RAM	I-Device
is	O
32-bit	O
for	O
CPU	O
access	O
only	O
)	O
and	O
the	O
Alice	O
chip	O
(	O
replacing	O
OCS/ECS	O
Agnus	B-Device
)	O
was	O
improved	O
to	O
be	O
able	O
to	O
support	O
full-width	O
access	O
for	O
bitplane	O
DMA	O
.	O
</s>
<s>
The	O
rest	O
of	O
the	O
chipset	O
remains	O
unchanged	O
,	O
as	O
do	O
the	O
Blitter	B-General_Concept
and	O
Copper	O
coprocessors	O
in	O
Alice	O
,	O
still	O
working	O
on	O
16-bit	O
data	O
.	O
</s>
