<s>
A	O
flash	O
emulator	O
or	O
flash	B-Application
memory	I-Application
emulator	I-Application
is	O
a	O
tool	O
that	O
is	O
used	O
to	O
temporarily	O
replace	O
flash	B-Device
memory	I-Device
or	O
ROM	B-Device
chips	I-Device
in	O
an	O
embedded	B-Architecture
device	I-Architecture
for	O
the	O
purpose	O
of	O
debugging	O
embedded	B-Application
software	I-Application
.	O
</s>
<s>
Such	O
tools	O
contain	O
Dual-ported	B-General_Concept
RAM	I-General_Concept
,	O
one	O
port	O
of	O
which	O
is	O
connected	O
to	O
a	O
target	O
system	O
(	O
i.e.	O
</s>
<s>
This	O
allows	O
the	O
programmer	O
to	O
change	O
executable	O
code	O
while	O
it	O
is	O
running	O
,	O
set	O
break	O
points	O
,	O
and	O
use	O
other	O
advanced	O
debugging	O
techniques	O
on	O
an	O
embedded	B-Architecture
system	I-Architecture
,	O
where	O
such	O
operations	O
would	O
not	O
be	O
possible	O
otherwise	O
.	O
</s>
<s>
This	O
type	O
of	O
tool	O
appeared	O
in	O
1980s-1990s	O
,	O
when	O
most	O
embedded	B-Architecture
systems	I-Architecture
were	O
using	O
discrete	O
ROM	B-Device
(	O
or	O
later	O
flash	B-Device
memory	I-Device
)	O
chip	O
,	O
containing	O
executable	O
code	O
.	O
</s>
<s>
This	O
allowed	O
for	O
easy	O
replacing	O
of	O
ROM/flash	O
chip	O
with	O
emulator	O
.	O
</s>
<s>
Later	O
,	O
when	O
most	O
embedded	B-Architecture
systems	I-Architecture
started	O
to	O
include	O
both	O
processor	O
and	O
flash	O
on	O
a	O
single	O
chip	O
for	O
cost	O
and	O
IP	O
protection	O
reasons	O
,	O
thus	O
making	O
external	O
flash	O
emulator	O
tool	O
impossible	O
,	O
search	O
for	O
a	O
replacement	O
tool	O
started	O
.	O
</s>
<s>
And	O
as	O
often	O
happens	O
when	O
a	O
direct	O
replacement	O
is	O
being	O
searched	O
for	O
,	O
many	O
replacement	O
techniques	O
contain	O
words	O
"	O
flash	O
emulation	O
"	O
in	O
them	O
,	O
for	O
example	O
,	O
TI	O
's	O
"	O
Flash	B-Application
Emulation	I-Application
Tool	I-Application
"	O
debugging	O
interface	O
(	O
FET	O
)	O
for	O
its	O
MSP430	O
chips	O
,	O
or	O
more	O
generic	O
in-circuit	B-Application
emulators	I-Application
,	O
even	O
though	O
none	O
of	O
two	O
above	O
had	O
anything	O
to	O
do	O
with	O
flash	O
or	O
emulation	O
as	O
it	O
is	O
.	O
</s>
<s>
Flash	O
emulator	O
could	O
also	O
be	O
retrofitted	O
to	O
an	O
embedded	B-Architecture
system	I-Architecture
to	O
facilitate	O
reverse	O
engineering	O
.	O
</s>
