<s>
A	O
legacy-free	B-Protocol
PC	I-Protocol
is	O
a	O
type	O
of	O
personal	B-Device
computer	I-Device
that	O
lacks	O
a	O
floppy	B-Device
and/or	O
optical	O
disc	O
drive	O
,	O
legacy	B-Device
ports	I-Device
,	O
and	O
an	O
Industry	B-Architecture
Standard	I-Architecture
Architecture	I-Architecture
(	O
ISA	O
)	O
bus	O
(	O
or	O
sometimes	O
,	O
any	O
internal	O
expansion	O
bus	O
at	O
all	O
)	O
.	O
</s>
<s>
According	O
to	O
Microsoft	O
,	O
"	O
The	O
basic	O
goal	O
for	O
these	O
requirements	O
is	O
that	O
the	O
operating	O
system	O
,	O
devices	O
,	O
and	O
end	O
users	O
cannot	O
detect	O
the	O
presence	O
of	O
the	O
following	O
:	O
ISA	B-Architecture
slots	I-Architecture
or	O
devices	O
;	O
legacy	O
floppy	B-Device
disk	I-Device
controller	O
(	O
FDC	O
)	O
;	O
and	O
PS/2	B-Device
,	O
serial	O
,	O
parallel	O
,	O
and	O
game	O
ports.	O
"	O
</s>
<s>
The	O
legacy	B-Device
ports	I-Device
are	O
usually	O
replaced	O
with	O
Universal	B-Protocol
Serial	I-Protocol
Bus	I-Protocol
(	O
USB	B-Protocol
)	O
ports	O
.	O
</s>
<s>
A	O
USB	B-Protocol
adapter	O
may	O
be	O
used	O
if	O
an	O
older	O
device	O
must	O
be	O
connected	O
to	O
a	O
PC	O
lacking	O
these	O
ports	O
.	O
</s>
<s>
According	O
to	O
the	O
2001	O
edition	O
of	O
Microsoft	O
's	O
PC	O
System	O
Design	O
Guide	O
,	O
a	O
legacy-free	B-Protocol
PC	I-Protocol
must	O
be	O
able	O
to	O
boot	O
from	O
a	O
USB	B-Protocol
device	O
.	O
</s>
<s>
Removing	O
older	O
,	O
usually	O
bulkier	O
ports	O
and	O
devices	O
allows	O
a	O
legacy-free	B-Protocol
PC	I-Protocol
to	O
be	O
much	O
more	O
compact	O
than	O
earlier	O
systems	O
and	O
many	O
fall	O
into	O
the	O
nettop	B-Protocol
or	O
all-in-one	B-Device
form	O
factor	O
.	O
</s>
<s>
Netbooks	B-Device
and	O
ultrabooks	B-Device
could	O
also	O
be	O
considered	O
a	O
portable	O
form	O
of	O
a	O
legacy-free	B-Protocol
PC	I-Protocol
.	O
</s>
<s>
Legacy-free	B-Protocol
PCs	I-Protocol
can	O
be	O
more	O
difficult	O
to	O
upgrade	O
than	O
a	O
traditional	O
beige	B-General_Concept
box	I-General_Concept
PC	O
,	O
and	O
are	O
more	O
typically	O
expected	O
to	O
be	O
replaced	O
completely	O
when	O
they	O
become	O
obsolete	O
.	O
</s>
<s>
Many	O
legacy-free	B-Protocol
PCs	I-Protocol
include	O
modern	O
devices	O
that	O
may	O
be	O
used	O
to	O
replace	O
ones	O
omitted	O
,	O
such	O
as	O
a	O
memory	B-Device
card	I-Device
reader	I-Device
replacing	O
the	O
floppy	B-Device
drive	I-Device
.	O
</s>
<s>
As	O
the	O
first	O
decade	O
of	O
the	O
21st	O
century	O
progressed	O
,	O
the	O
legacy-free	B-Protocol
PC	I-Protocol
went	O
mainstream	O
,	O
with	O
legacy	B-Device
ports	I-Device
removed	O
from	O
commonly	O
available	O
computer	O
systems	O
in	O
all	O
form	O
factors	O
.	O
</s>
<s>
However	O
,	O
the	O
PS/2	B-Protocol
keyboard	I-Protocol
connector	O
still	O
retains	O
some	O
use	O
,	O
as	O
it	O
can	O
offer	O
some	O
uses	O
(	O
e.g.	O
</s>
<s>
implementation	O
of	O
n-key	O
rollover	O
)	O
not	O
offered	O
by	O
USB	B-Protocol
.	O
</s>
<s>
With	O
those	O
parts	O
becoming	O
increasingly	O
rare	O
on	O
newer	O
computers	O
as	O
of	O
the	O
late	O
2010s	O
and	O
early	O
2020s	O
,	O
the	O
term	O
"	O
legacy-free	B-Protocol
PC	I-Protocol
"	O
itself	O
have	O
also	O
become	O
increasingly	O
rare	O
.	O
</s>
<s>
In	O
1987	O
,	O
IBM	O
released	O
the	O
IBM	B-Device
PS/2	I-Device
line	O
with	O
new	O
internal	B-Device
architecture	I-Device
;	O
the	O
BIOS	B-Operating_System
and	O
the	O
new	O
PS/2	B-Protocol
port	I-Protocol
and	O
VGA	B-Protocol
port	O
was	O
introduced	O
,	O
but	O
this	O
line	O
was	O
heavily	O
criticized	O
for	O
a	O
relatively	O
high-closed	O
proprietary	O
architecture	O
and	O
low	O
compatibility	O
with	O
PC-cloned	O
hardware	O
.	O
</s>
<s>
The	O
first	O
known	O
as	O
legacy-free	O
notebook	O
computer	O
,	O
released	O
in	O
1988	O
,	O
was	O
the	O
NEC	B-Device
UltraLite	I-Device
laptop	O
,	O
which	O
omitted	O
integrated	O
floppy	B-Device
and	O
with	O
limited	O
internal	O
storage	O
,	O
also	O
can	O
be	O
described	O
as	O
Legacy-free	O
machine	O
.	O
</s>
<s>
In	O
1998	O
,	O
Apple	O
's	O
iMac	B-Device
G3	I-Device
was	O
introduced	O
as	O
the	O
first	O
widely	O
known	O
example	O
of	O
a	O
legacy-free	B-Protocol
PC	I-Protocol
,	O
and	O
drew	O
much	O
criticism	O
for	O
its	O
lack	O
of	O
legacy	O
peripherals	O
such	O
as	O
a	O
floppy	B-Device
drive	I-Device
and	O
Apple	B-Device
Desktop	I-Device
Bus	I-Device
(	O
ADB	O
)	O
connector	O
;	O
However	O
,	O
its	O
success	O
popularized	O
USB	B-Protocol
ports	O
.	O
</s>
<s>
Compaq	O
released	O
the	O
iPaq	B-Device
desktop	I-Device
in	O
1999	O
.	O
</s>
<s>
From	O
November	O
1999	O
to	O
July	O
2000	O
,	O
Dell	O
's	O
WebPC	B-Device
was	O
an	O
early	O
less-successful	O
Wintel	B-Device
legacy-free	B-Protocol
PC	I-Protocol
.	O
</s>
<s>
More	O
legacy-free	B-Protocol
PCs	I-Protocol
were	O
introduced	O
around	O
2000	O
after	O
the	O
prevalence	O
of	O
USB	B-Protocol
and	O
broadband	O
internet	O
made	O
many	O
of	O
the	O
older	O
ports	O
and	O
devices	O
obsolete	O
.	O
</s>
<s>
The	O
Dell	B-Device
Studio	I-Device
Hybrid	O
,	O
Asus	B-Protocol
Eee	I-Protocol
Box	I-Protocol
and	O
MSI	B-Device
Wind	I-Device
PC	I-Device
are	O
examples	O
of	O
later	O
,	O
more-successful	O
Intel-based	O
legacy-free	B-Protocol
PCs	I-Protocol
.	O
</s>
<s>
Apple	O
introduced	O
the	O
Apple	B-Device
Modem	I-Device
on	O
October	O
12	O
,	O
2005	O
and	O
removed	O
the	O
internal	O
56K	O
modem	O
on	O
new	O
computers	O
.	O
</s>
<s>
The	O
MacBook	B-Device
Air	I-Device
,	O
introduced	O
on	O
January	O
29	O
,	O
2008	O
,	O
also	O
omits	O
a	O
built-in	O
SuperDrive	B-Device
and	O
wired	O
Ethernet	O
connectivity	O
that	O
was	O
available	O
on	O
all	O
other	O
Mac	O
computers	O
sold	O
at	O
the	O
time	O
.	O
</s>
<s>
The	O
SuperDrive	B-Device
would	O
later	O
be	O
removed	O
from	O
all	O
Macs	O
by	O
the	O
end	O
of	O
2016	O
,	O
and	O
wired	O
Ethernet	O
would	O
later	O
be	O
removed	O
from	O
all	O
MacBook	B-Device
models	O
.	O
</s>
<s>
Intel	O
introduced	O
their	O
LGA	B-Device
775	I-Device
CPU	O
socket	O
in	O
2004	O
,	O
replacing	O
their	O
previous	O
CPUs	O
and	O
sockets	O
with	O
PGA	O
packaging	O
.	O
</s>
<s>
Northbridge	B-Device
,	O
southbridge	B-Device
,	O
and	O
FSB	B-Architecture
have	O
been	O
replaced	O
by	O
more	O
integrated	O
architectures	O
starting	O
from	O
early	O
2010s	O
.	O
</s>
<s>
The	O
relaunched	O
MacBook	B-Device
in	O
2015	O
dropped	O
features	O
such	O
as	O
the	O
MagSafe	O
charging	O
port	O
and	O
the	O
Secure	B-Device
Digital	I-Device
(	O
SD	O
)	O
memory	B-Device
card	I-Device
reader	I-Device
.	O
</s>
<s>
It	O
only	O
kept	O
two	O
types	O
of	O
ports	O
:	O
a	O
3.5	B-Device
mm	I-Device
audio	I-Device
jack	I-Device
and	O
a	O
USB	B-Protocol
3.1	O
Type-C	O
port	O
.	O
</s>
<s>
This	O
configuration	O
later	O
found	O
its	O
way	O
in	O
the	O
MacBook	B-Device
Pro	I-Device
in	O
2016	O
,	O
the	O
only	O
difference	O
being	O
that	O
two	O
or	O
four	O
Thunderbolt	O
3	O
ports	O
were	O
included	O
instead	O
of	O
just	O
one	O
.	O
</s>
<s>
In	O
addition	O
,	O
all	O
MacBook	B-Device
Pro	I-Device
except	O
for	O
the	O
entry-level	O
model	O
replaced	O
the	O
function	B-Application
keys	I-Application
with	O
a	O
Touch	O
Bar	O
.	O
</s>
<s>
However	O
,	O
the	O
2021	O
MacBook	B-Device
Pro	I-Device
models	O
one	O
again	O
include	O
function	B-Application
keys	I-Application
and	O
do	O
not	O
feature	O
a	O
Touch	O
Bar	O
,	O
seemingly	O
in	O
response	O
to	O
the	O
aforementioned	O
poor	O
reception	O
.	O
</s>
<s>
The	O
legacy	B-Operating_System
BIOS	I-Operating_System
was	O
replaced	O
by	O
the	O
Unified	B-Architecture
Extensible	I-Architecture
Firmware	I-Architecture
Interface	I-Architecture
.	O
</s>
<s>
PCI	B-Protocol
has	O
fallen	O
out	O
of	O
favor	O
,	O
as	O
it	O
has	O
been	O
superseded	O
by	O
PCIe	O
.	O
</s>
