<s>
BlackBerry	B-Application
950	I-Application
(	O
introduced	O
as	O
"	O
Inter	O
@ctive	O
Pager	O
950	O
"	O
,	O
development	O
name	O
"	O
Leapfrog	O
"	O
)	O
is	O
an	O
early	O
BlackBerry	B-Operating_System
model	O
,	O
introduced	O
in	O
1998	O
by	O
Canadian	O
smartphone	B-Application
manufacturer	O
Research	O
in	O
Motion	O
.	O
</s>
<s>
There	O
were	O
two	O
editions	O
,	O
the	O
Exchange	O
Edition	O
and	O
the	O
Internet	O
Edition	O
,	O
both	O
identical	O
in	O
hardware	O
and	O
differing	O
only	O
in	O
the	O
provided	O
software	O
;	O
the	O
Exchange	O
Edition	O
could	O
connect	O
to	O
corporate	O
email	O
mailboxes	O
running	O
on	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
,	O
while	O
the	O
Internet	O
Edition	O
could	O
access	O
general	O
internet	O
mailboxes	O
only	O
.	O
</s>
<s>
BlackBerry	B-Operating_System
850	O
was	O
a	O
different	O
version	O
of	O
this	O
pager	O
,	O
released	O
at	O
later	O
time	O
,	O
which	O
,	O
instead	O
of	O
900MHz	O
modem	B-Application
,	O
had	O
an	O
800MHz	O
modem	B-Application
that	O
allowed	O
connectivity	O
with	O
the	O
DataTAC	B-General_Concept
network	O
.	O
</s>
<s>
one	O
AA	B-Algorithm
battery	I-Algorithm
for	O
power	O
that	O
lasted	O
two	O
weeks.The	O
pager	O
would	O
beep	O
and	O
vibrate	O
in	O
protest	O
if	O
the	O
battery	O
polarization	O
was	O
reversed	O
when	O
inserted	O
the	O
wrong	O
way	O
.	O
</s>
<s>
RIM	O
OS	O
,	O
the	O
operating	O
system	O
designed	O
for	O
those	O
devices	O
,	O
was	O
a	O
cooperative	B-Operating_System
multitasking	I-Operating_System
system	O
with	O
message	B-Architecture
passing	I-Architecture
infrastructure	O
that	O
depended	O
on	O
the	O
applications	O
to	O
use	O
message	B-General_Concept
loop	I-General_Concept
for	O
processing	O
events	O
from	O
the	O
user	O
interface	O
,	O
in	O
a	O
fashion	O
similar	O
to	O
that	O
of	O
Microsoft	O
Windows	O
.	O
</s>
<s>
RIM	O
OS	O
used	O
memory	O
protection	O
provided	O
by	O
the	O
MMU	O
of	O
the	O
80386EX	B-Device
.	O
</s>
<s>
Applications	O
were	O
written	O
in	O
C++	B-Language
and	O
compiled	O
into	O
files	O
that	O
followed	O
the	O
PE	O
file	O
format	O
originally	O
used	O
on	O
Microsoft	O
Windows	O
,	O
which	O
itself	O
was	O
based	O
on	O
Common	O
Object	O
File	O
Format	O
that	O
first	O
appeared	O
on	O
Unix	O
.	O
</s>
<s>
Applications	O
,	O
upon	O
being	O
sideloaded	B-Protocol
with	O
BlackBerry	B-Operating_System
Desktop	O
Manager	O
,	O
would	O
be	O
stripped	O
of	O
all	O
the	O
unnecessary	O
data	O
that	O
was	O
included	O
in	O
the	O
.dll	O
files	O
,	O
and	O
would	O
be	O
linked	B-Application
with	O
the	O
rest	O
of	O
the	O
code	O
on	O
the	O
device	O
allowing	O
them	O
execute	B-Application
in	I-Application
place	I-Application
from	O
the	O
flash	B-Device
memory	I-Device
.	O
</s>
