<s>
The	O
Cascade	B-Application
virus	I-Application
(	O
also	O
known	O
as	O
Herbstlaub	B-Application
in	O
Germany	O
)	O
is	O
a	O
prominent	O
computer	O
virus	O
that	O
was	O
a	O
resident	O
written	O
in	O
assembly	B-Language
language	I-Language
,	O
that	O
was	O
widespread	O
in	O
the	O
1980s	O
and	O
early	O
1990s	O
.	O
</s>
<s>
It	O
infected	O
.COM	O
files	O
and	O
had	O
the	O
effect	O
of	O
making	O
text	O
on	O
the	O
screen	O
fall	O
(	O
or	O
cascade	B-Application
)	O
down	O
and	O
form	O
a	O
heap	O
at	O
the	O
bottom	O
of	O
the	O
screen	O
.	O
</s>
<s>
In	O
response	O
,	O
IBM	O
developed	O
its	O
own	O
antivirus	B-Application
software	I-Application
.	O
</s>
<s>
Cascade-17Y4	O
,	O
which	O
is	O
reported	O
to	O
have	O
originated	O
in	O
Yugoslavia	O
,	O
is	O
almost	O
identical	O
to	O
the	O
most	O
common	O
1704	O
byte	O
variant	O
.	O
</s>
