<s>
The	O
HP	B-Device
LaserJet	I-Device
4	I-Device
(	O
abbreviated	O
sometimes	O
to	O
LJ4	O
or	O
HP4	O
)	O
is	O
a	O
group	O
of	O
monochrome	O
laser	O
printers	O
produced	O
in	O
the	O
early	O
to	O
mid-1990s	O
as	O
part	O
of	O
the	O
LaserJet	O
series	O
by	O
Hewlett-Packard	O
(	O
HP	O
)	O
.	O
</s>
<s>
The	O
4	O
series	O
has	O
various	O
models	O
,	O
including	O
the	O
standard	O
LaserJet	B-Device
4	I-Device
for	O
business	O
use	O
,	O
the	O
4L	O
for	O
personal	O
use	O
and	O
the	O
4P	O
for	O
small	O
businesses	O
.	O
</s>
<s>
There	O
are	O
also	O
PostScript	B-Language
variants	O
of	O
these	O
machines	O
with	O
the	O
'	O
4M	O
 '	O
designation	O
,	O
where	O
M	O
stands	O
for	O
,	O
but	O
is	O
not	O
limited	O
to	O
,	O
usage	O
with	O
an	O
Apple	B-Device
Macintosh	I-Device
.	O
</s>
<s>
The	O
LaserJet	B-Device
4	I-Device
,	O
especially	O
the	O
4/4M/4	O
+	O
/4M	O
+	O
models	O
,	O
have	O
become	O
known	O
for	O
their	O
durability	O
,	O
mainly	O
due	O
to	O
their	O
reliable	O
construction	O
,	O
as	O
well	O
as	O
the	O
printers	O
built-in	O
PCL	B-Language
(	O
and	O
optional	O
PostScript	B-Language
)	O
printer	O
language	O
support	O
which	O
is	O
still	O
used	O
in	O
computers	O
to	O
this	O
day	O
.	O
</s>
<s>
Hewlett-Packard	O
dominated	O
the	O
laser	O
printing	O
sector	O
during	O
this	O
time	O
in	O
part	O
due	O
to	O
their	O
reliability	O
,	O
relatively	O
affordable	O
pricing	O
,	O
and	O
the	O
spread	O
of	O
LaserJet	B-Device
4	I-Device
models	O
from	O
personal	O
use	O
up	O
to	O
heavy	O
business	O
use	O
.	O
</s>
<s>
The	O
LaserJet	B-Device
4	I-Device
series	O
was	O
discontinued	O
in	O
the	O
1990s	O
,	O
and	O
Hewlett-Packard	O
recommended	O
the	O
HP	B-Device
LaserJet	I-Device
5	I-Device
series	O
as	O
a	O
replacement	O
for	O
the	O
4	O
series	O
.	O
</s>
<s>
However	O
the	O
driver	O
for	O
the	O
HP	B-Device
LaserJet	I-Device
4	I-Device
exists	O
in	O
most	O
,	O
even	O
older	O
,	O
software	O
products	O
and	O
is	O
a	O
popular	O
substitute	O
driver	O
for	O
other	O
PCL	B-Language
compatible	O
printers	O
.	O
</s>
<s>
However	O
,	O
any	O
printer	O
mechanism	O
is	O
subject	O
to	O
wear	O
and	O
degeneration	O
,	O
and	O
typically	O
printers	O
still	O
in	O
use	O
have	O
now	O
seen	O
long	O
service	O
(	O
the	O
machine	O
being	O
discontinued	O
with	O
the	O
introduction	O
of	O
the	O
Laserjet	B-Device
5	I-Device
in	O
1995	O
)	O
.	O
</s>
<s>
Introduced	O
in	O
1992	O
,	O
this	O
is	O
the	O
original	O
LaserJet	B-Device
4	I-Device
with	O
the	O
Canon	O
EX	O
laser	O
print	O
engine	O
.	O
</s>
<s>
The	O
LaserJet	B-Device
4	I-Device
Plus	O
(	O
4+	O
)	O
,	O
released	O
in	O
1994	O
,	O
was	O
the	O
LaserJet	B-Device
4	I-Device
with	O
the	O
improved	O
Canon	O
EX+	O
engine	O
which	O
increased	O
printing	O
speed	O
to	O
12	O
PPM	O
.	O
</s>
<s>
These	O
models	O
also	O
feature	O
a	O
20-30W	O
power	O
saving	O
(	O
stand-by	O
)	O
mode	O
,	O
which	O
was	O
not	O
included	O
in	O
the	O
original	O
Laserjet	B-Device
4	I-Device
.	O
</s>
<s>
The	O
4Si	O
(	O
and	O
4Si	O
MX	O
for	O
the	O
Macintosh	B-Device
)	O
were	O
heavy-duty	O
business	O
printers	O
,	O
produced	O
using	O
the	O
Canon	O
NX	O
engine	O
.	O
</s>
<s>
The	O
LaserJet	B-Device
4	I-Device
series	O
had	O
small	O
printers	O
in	O
the	O
range	O
:	O
the	O
personal-use	O
4L	O
and	O
the	O
small-business	O
use	O
4P	O
(	O
and	O
the	O
Macintosh-compatible	O
4ML	O
and	O
4MP	O
)	O
.	O
</s>
<s>
The	O
4V	O
series	O
was	O
the	O
first	O
HP	O
printer	O
to	O
offer	O
an	O
internal	O
hard	B-Device
disk	I-Device
option	O
.	O
</s>
<s>
Both	O
of	O
these	O
printers	O
used	O
a	O
2	O
byte	O
PCL	B-Language
that	O
had	O
been	O
recently	O
developed	O
for	O
Asian	O
fonts	O
,	O
and	O
came	O
with	O
memory	O
upgrades	O
and	O
Chinese/Japanese	O
fonts	O
.	O
</s>
<s>
In	O
all	O
the	O
models	O
of	O
the	O
four	O
series	O
an	O
'	O
M	O
 '	O
designation	O
identifies	O
a	O
version	O
designed	O
to	O
work	O
well	O
with	O
the	O
Apple	B-Device
Macintosh	I-Device
,	O
with	O
additional	O
accessories	O
for	O
network	O
connectivity	O
(	O
JetDirect	O
(	O
Ethernet	O
)	O
/LocalTalk	O
)	O
,	O
PostScript	B-Language
Level	O
2	O
support	O
and	O
more	O
memory	O
,	O
built-in	O
as	O
standard	O
.	O
</s>
<s>
+	O
Comparison	O
table	O
of	O
HP	B-Device
LaserJet	I-Device
4	I-Device
modelsModelIntroductionCanon	O
print	O
enginePrint	O
resolution	O
(	O
DPI	O
)	O
Resolution	O
is	O
given	O
in	O
dots	O
per	O
inch	O
(	O
DPI	O
)	O
Print	O
speed	O
(	O
PPM	O
)	O
Print	O
speed	O
is	O
given	O
in	O
pages	O
per	O
minute	O
(	O
PPM	O
)	O
Standard	O
memory	O
(	O
RAM	O
in	O
MB	O
)	O
Maximum	O
memory	O
(	O
RAM	O
in	O
MB	O
)	O
4	O
(	O
4M	O
)	O
October	O
1992EX60082	O
(	O
6	O
)	O
HP	O
Support	O
-	O
LaserJet	B-Device
4	I-Device
model	O
comparison	O
(	O
Accessed	O
June	O
30	O
,	O
2006	O
)	O
34	O
(	O
26	O
)	O
4Si	O
(	O
4Si	O
MX	O
)	O
April	O
1993NX600172344L	O
(	O
4ML	O
)	O
May	O
1993PX30041	O
(	O
2	O
)	O
HP	O
LaserJet	O
4L	O
,	O
5L	O
,	O
6L	O
Printers	O
-	O
Comparison	O
(	O
Accessed	O
March	O
5	O
,	O
2009	O
)	O
2	O
(	O
2	O
)	O
4P	O
(	O
4MP	O
)	O
October	O
1993PX-II60042	O
(	O
6	O
)	O
26	O
(	O
22	O
)	O
4+	O
(	O
4M+	O
)	O
May	O
1994EX+600122	O
(	O
6	O
)	O
66	O
(	O
50	O
)	O
4V	O
(	O
4MV	O
)	O
September	O
1994BX-II600164(12 )	O
68(52 )	O
4LC/4LJ	O
ProApril/May	O
1995	O
?	O
600	O
?	O
2	O
?	O
</s>
