<s>
The	O
IBM	B-Device
ThinkPad	I-Device
T20	I-Device
series	I-Device
was	O
a	O
series	O
of	O
notebook	B-Device
computers	I-Device
introduced	O
in	O
May	O
2000	O
by	O
IBM	O
as	O
the	O
successor	O
of	O
the	O
600	B-Device
series	I-Device
and	O
the	O
first	O
model	O
of	O
the	O
T-series	O
which	O
exists	O
today	O
under	O
Lenovo	O
ownership	O
.	O
</s>
<s>
Four	O
models	O
were	O
produced	O
,	O
the	O
T20	O
,	O
T21	O
,	O
T22	O
,	O
and	O
T23	O
;	O
the	O
series	O
was	O
succeeded	O
in	O
May	O
2002	O
by	O
the	O
ThinkPad	B-Device
T30	I-Device
,	O
but	O
was	O
produced	O
until	O
July	O
2003	O
.	O
</s>
<s>
The	O
T20	O
series	O
succeeded	O
the	O
600	B-Device
series	I-Device
,	O
adding	O
new	O
features	O
such	O
as	O
S-Video	O
output	O
,	O
an	O
Ethernet	O
port	O
,	O
and	O
the	O
UltraBay	B-Architecture
2000	O
hot-swappable	O
bay	O
.	O
</s>
<s>
The	O
graphics	O
card	O
was	O
upgraded	O
from	O
the	O
4MB	O
NeoMagic	O
256ZX	O
which	O
was	O
used	O
in	O
the	O
600X	O
,	O
to	O
an	O
8MB	O
S3	B-Device
Savage	I-Device
(	O
16MB	O
on	O
T23	O
models	O
)	O
which	O
was	O
capable	O
of	O
rendering	O
3D	O
graphics	O
in	O
hardware	O
.	O
</s>
<s>
The	O
ThinkPad	B-Device
T23	I-Device
was	O
also	O
the	O
first	O
ThinkPad	B-Operating_System
laptop	B-Device
model	O
to	O
offer	O
an	O
optional	O
WiFi	O
connection	O
via	O
a	O
Mini-PCI	O
card	O
,	O
using	O
wireless	O
antennas	O
which	O
were	O
built	O
into	O
the	O
lid	O
on	O
select	O
upper-end	O
models	O
.	O
</s>
<s>
The	O
T20	O
series	O
originally	O
shipped	O
with	O
either	O
Windows	B-Device
98	I-Device
,	O
Windows	B-Application
2000	I-Application
,	O
or	O
Linux	B-Application
,	O
with	O
later	O
T23	O
models	O
shipping	O
with	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
All	O
T20	O
models	O
were	O
capable	O
of	O
running	O
Windows	O
3.x	O
,	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Device
NT	I-Device
4.0	I-Device
,	O
OS/2	O
Warp	O
4	O
,	O
or	O
Windows	B-Device
Me	I-Device
as	O
well	O
as	O
various	O
Linux	B-Application
distributions	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
T23	O
was	O
capable	O
of	O
running	O
Windows	B-Application
Vista	I-Application
or	O
Windows	B-Device
7	I-Device
,	O
if	O
equipped	O
with	O
at	O
least	O
512MB	O
of	O
memory	O
.	O
</s>
<s>
ThinkPad	B-Device
T20	I-Device
-	O
First	O
model	O
shipped	O
,	O
featured	O
a	O
Pentium	B-General_Concept
III	I-General_Concept
at	O
650	O
,	O
700	O
or	O
750MHz	O
,	O
all	O
with	O
SpeedStep	B-Device
technology	O
.	O
</s>
<s>
This	O
model	O
shipped	O
with	O
either	O
a	O
13.3	O
"	O
XGA	O
TFT	B-Device
or	O
14.1	O
"	O
XGA	O
TFT	B-Device
display	I-Device
,	O
and	O
shipped	O
with	O
an	O
external	O
floppy	O
drive	O
,	O
a	O
swappable	O
CD-ROM	O
or	O
DVD-ROM	O
drive	O
,	O
and	O
a	O
choice	O
of	O
a	O
6GB	O
,	O
12GB	O
,	O
or	O
a	O
20GB	O
hard	O
drive	O
.	O
</s>
<s>
ThinkPad	B-Device
T21	I-Device
-	O
Featuring	O
an	O
upgraded	O
Pentium	B-General_Concept
III	I-General_Concept
processor	O
at	O
either	O
750MHz	O
,	O
800MHz	O
,	O
or	O
850MHz	O
,	O
the	O
T21	O
featured	O
either	O
a	O
13.3	O
"	O
XGA	O
TFT	B-Device
,	O
14.1	O
"	O
XGA	O
TFT	B-Device
,	O
or	O
a	O
new	O
14.1	O
"	O
SXGA+	O
TFT	B-Device
display	I-Device
(	O
exclusive	O
to	O
850MHz	O
models	O
)	O
.	O
</s>
<s>
The	O
T21	O
features	O
either	O
a	O
mini-PCI	O
modem	B-Application
card	O
or	O
an	O
Ethernet/modem	O
combo	O
card	O
,	O
one	O
USB	B-Protocol
1.1	O
port	O
,	O
PC	O
Card	O
Slot	O
,	O
and	O
128MB	O
of	O
RAM	O
standard	O
(	O
upgradeable	O
to	O
512MB	O
using	O
PC100	O
SODIMMs	O
)	O
.	O
</s>
<s>
ThinkPad	B-Device
T22	I-Device
-	O
Featuring	O
an	O
upgraded	O
Pentium	B-General_Concept
III	I-General_Concept
processor	O
at	O
either	O
800MHz	O
,	O
900MHz	O
,	O
or	O
1.00GHz	O
,	O
the	O
T22	O
featured	O
either	O
a	O
13.3	O
"	O
XGA	O
TFT	B-Device
,	O
14.1	O
"	O
XGA	O
TFT	B-Device
,	O
or	O
14.1	O
"	O
SXGA+	O
TFT	B-Device
display	I-Device
as	O
standard	O
.	O
</s>
<s>
This	O
model	O
shipped	O
a	O
mini-PCI	O
modem	B-Application
card	O
or	O
an	O
Ethernet/modem	O
combo	O
card	O
,	O
one	O
USB	B-Protocol
1.1	O
port	O
,	O
PC	O
Card	O
Slot	O
,	O
a	O
swappable	O
CD-ROM	O
or	O
DVD-ROM	O
drive	O
,	O
either	O
a	O
10GB	O
,	O
20GB	O
or	O
32GB	O
hard	O
drive	O
,	O
and	O
128MB	O
or	O
256MB	O
of	O
RAM	O
standard	O
(	O
upgradeable	O
to	O
512MB	O
using	O
PC100	O
SODIMMs	O
)	O
.	O
</s>
<s>
ThinkPad	B-Device
T23	I-Device
-	O
The	O
final	O
model	O
of	O
the	O
T20	O
series	O
,	O
featuring	O
the	O
new	O
Tualatin	O
Pentium	O
III-M	O
at	O
either	O
866MHz	O
,	O
1.00GHz	O
,	O
1.13GHz	O
,	O
or	O
1.20GHz	O
(	O
all	O
with	O
SpeedStep	B-Device
technology	O
)	O
and	O
either	O
a	O
13.3	O
"	O
XGA	O
TFT	B-Device
,	O
14.1	O
"	O
XGA	O
TFT	B-Device
,	O
or	O
14.1	O
"	O
SXGA+	O
TFT	B-Device
display	I-Device
as	O
standard	O
.	O
</s>
<s>
This	O
model	O
shipped	O
with	O
2	O
USB	B-Protocol
1.1	O
ports	O
rather	O
than	O
only	O
one	O
,	O
a	O
15GB	O
to	O
60GB	O
hard	O
drive	O
,	O
a	O
Mini-PCI	O
Modem	B-Application
or	O
Wireless	O
card	O
(	O
on	O
select	O
models	O
)	O
,	O
a	O
CD-ROM	O
,	O
DVD-ROM	O
,	O
CD-RW	O
or	O
combo	O
(	O
CD-RW/DVD	O
)	O
drive	O
,	O
and	O
either	O
128MB	O
or	O
256MB	O
of	O
RAM	O
standard	O
(	O
upgradeable	O
to	O
1GB	O
using	O
PC133	O
SODIMMs	O
)	O
.	O
</s>
