<s>
The	B-General_Concept
Apple	I-General_Concept
Worm	I-General_Concept
is	O
a	O
computer	B-Application
program	I-Application
written	O
by	O
Apple	O
Computer	O
,	O
and	O
especially	O
for	O
the	O
6502	B-General_Concept
microprocessor	I-General_Concept
,	O
which	O
performs	O
dynamic	O
self-relocation	O
.	O
</s>
<s>
The	O
source	O
code	O
of	O
the	B-General_Concept
Apple	I-General_Concept
Worm	I-General_Concept
is	O
the	O
first	O
program	O
printed	O
in	O
its	O
entirety	O
in	O
Scientific	O
American	O
.	O
</s>
<s>
The	B-General_Concept
Apple	I-General_Concept
Worm	I-General_Concept
was	O
designed	O
and	O
developed	O
by	O
James	O
R	O
.	O
Hauser	O
and	O
William	O
R	O
.	O
Buckley	O
.	O
</s>
<s>
Other	O
example	O
Apple	B-General_Concept
Worm	I-General_Concept
programs	O
are	O
described	O
in	O
the	O
cover	O
story	O
of	O
the	O
November	O
1986	O
issue	O
of	O
Call_A.P.P.L.E.	O
</s>
<s>
Because	O
the	B-General_Concept
Apple	I-General_Concept
Worm	I-General_Concept
performs	O
dynamic	O
self-relocation	O
within	O
the	O
one	O
main	B-General_Concept
memory	I-General_Concept
of	O
one	O
computer	O
,	O
it	O
does	O
not	O
constitute	O
a	O
computer	O
virus	O
,	O
an	O
apt	O
if	O
somewhat	O
inaccurate	O
description	O
.	O
</s>
<s>
A	O
typical	O
computer	B-Application
program	I-Application
manipulates	O
data	O
which	O
is	O
external	O
to	O
the	O
corporeal	O
representation	O
of	O
the	O
computer	B-Application
program	I-Application
.	O
</s>
<s>
The	O
instruction	O
set	O
of	O
the	O
PDP-11	B-Device
computer	O
includes	O
an	O
instruction	O
for	O
moving	O
data	O
,	O
which	O
when	O
constructed	O
in	O
a	O
particular	O
form	O
causes	O
itself	O
to	O
be	O
moved	O
from	O
higher	O
addresses	O
to	O
lower	O
addresses	O
;	O
the	O
form	O
includes	O
an	O
automatic	O
decrement	O
of	O
the	O
instruction	O
pointer	O
register	O
.	O
</s>
<s>
A	O
more	O
current	O
example	O
of	O
a	O
self-relocating	O
program	O
is	O
an	O
adaptation	O
of	O
the	B-General_Concept
Apple	I-General_Concept
Worm	I-General_Concept
for	O
the	O
Intel	B-Operating_System
80x86	I-Operating_System
microprocessor	O
and	O
its	O
derivatives	O
,	O
such	O
as	O
the	O
Pentium	B-Device
,	O
and	O
corresponding	O
AMD	O
microprocessors	O
.	O
</s>
