<s>
ARGUS	O
,	O
an	O
acronym	O
for	O
Automatic	O
Routine	O
Generating	O
and	O
Updating	O
System	O
,	O
was	O
an	O
Assembly	B-Language
Language	I-Language
devised	O
in	O
the	O
late	O
1950s	O
by	O
Honeywell	O
for	O
their	O
Honeywell	B-Device
800	I-Device
and	O
1800	O
computers	O
.	O
</s>
<s>
As	O
with	O
other	O
Assembly	B-Language
Languages	I-Language
,	O
each	O
line	O
of	O
ARGUS	O
was	O
copied	O
on	O
to	O
one	O
card	O
and	O
related	O
to	O
one	O
word	O
in	O
memory	O
,	O
except	O
that	O
one	O
ARGUS	O
command	O
,	O
RESERVE	O
,	O
could	O
reserve	O
any	O
specified	O
number	O
of	O
words	O
in	O
the	O
position	O
specified	O
.	O
</s>
<s>
The	O
Honeywell	B-Device
800	I-Device
and	O
1800	O
had	O
a	O
main	O
memory	O
and	O
a	O
control	O
memory	O
,	O
both	O
using	O
ferrite	O
cores	O
.	O
</s>
<s>
The	O
main	O
memory	O
had	O
between	O
4	O
and	O
16	O
banks	B-General_Concept
,	O
depending	O
on	O
customer	O
requirements	O
.	O
</s>
<s>
The	O
actual	O
number	O
of	O
banks	B-General_Concept
in	O
an	O
individual	O
installation	O
had	O
to	O
be	O
a	O
multiple	O
of	O
4	O
.	O
</s>
<s>
The	O
control	O
memory	O
had	O
256	O
registers	B-General_Concept
of	O
16	O
bits	O
each	O
.	O
</s>
<s>
At	O
any	O
given	O
time	O
the	O
machine	O
could	O
theoretically	O
run	O
one	O
Operating	O
System	O
and	O
7	O
application	O
programs	O
,	O
each	O
with	O
exclusive	O
use	O
of	O
32	O
registers	B-General_Concept
.	O
</s>
<s>
A	O
number	O
(	O
decimal	B-Application
)	O
can	O
be	O
added	O
to	O
this	O
,	O
e.g.	O
</s>
<s>
This	O
applies	O
only	O
to	O
8	O
registers	B-General_Concept
,	O
called	O
index	O
registers	B-General_Concept
.	O
</s>
<s>
In	O
ARGUS	O
:	O
X0	O
,	O
35	O
or	O
0	O
,	O
35	O
means	O
use	O
Index	O
Register	O
0	O
,	O
increase	O
that	O
number	O
by	O
35	O
(	O
decimal	B-Application
)	O
and	O
read	O
from	O
or	O
write	O
to	O
that	O
location	O
in	O
main	O
memory	O
.	O
</s>
<s>
As	O
mentioned	O
,	O
the	O
program	O
had	O
access	O
to	O
32	O
registers	B-General_Concept
.	O
</s>
<s>
8	O
had	O
special	O
functions	O
,	O
16	O
registers	B-General_Concept
(	O
R0	O
to	O
R15	O
)	O
were	O
general	O
purpose	O
and	O
8	O
(	O
X0	O
to	O
X7	O
)	O
were	O
index	O
registers	B-General_Concept
.	O
</s>
<s>
Index	O
addressing	O
was	O
only	O
possible	O
for	O
index	O
registers	B-General_Concept
.	O
</s>
<s>
Direct	O
and	O
Indirect	O
addressing	O
were	O
applicable	O
to	O
both	O
general	O
purpose	O
and	O
index	O
registers	B-General_Concept
.	O
</s>
<s>
They	O
would	O
probably	O
work	O
with	O
other	O
registers	B-General_Concept
too	O
but	O
that	O
would	O
be	O
bad	O
practice	O
.	O
</s>
<s>
The	O
special	O
registers	B-General_Concept
were	O
:	O
</s>
<s>
DA	O
and	O
DS	O
(	O
Decimal	B-Application
Add	O
and	O
Decimal	B-Application
Subtract	O
)	O
treat	O
the	O
two	O
input	O
numbers	O
as	O
signed	O
decimal	B-Application
.	O
</s>
<s>
DM	O
is	O
fully	O
supported	O
by	O
the	O
Floating	B-Algorithm
Point	I-Algorithm
Adaptor	O
.	O
</s>
<s>
The	O
number	O
of	O
times	O
is	O
specified	O
as	O
a	O
decimal	B-Application
number	O
in	O
address	O
field	O
B	O
.	O
</s>
<s>
As	O
for	O
MT	O
this	O
is	O
a	O
decimal	B-Application
number	O
that	O
ends	O
up	O
in	O
binary	O
in	O
the	O
operation	O
section	O
of	O
the	O
machine	O
command	O
.	O
</s>
<s>
This	O
command	O
used	O
registers	B-General_Concept
AU1	O
and	O
AU2	O
to	O
manage	O
the	O
address	O
increments	O
.	O
</s>
<s>
Then	O
B	O
to	O
G	O
indicate	O
decimal	B-Application
10	O
to	O
15	O
,	O
which	O
in	O
binary	O
is	O
1010	O
to	O
1111	O
.	O
</s>
<s>
DEC	O
The	O
punched	O
letter	O
or	O
number	O
is	O
translated	O
into	O
a	O
four	O
bit	O
decimal	B-Application
code	O
.	O
</s>
<s>
x	O
was	O
B	O
,	O
D	O
or	O
A	O
representing	O
Binary	O
,	O
Decimal	B-Application
or	O
Alphanumeric	O
,	O
i.e.	O
</s>
<s>
This	O
would	O
request	O
the	O
assembler	B-Language
to	O
insert	O
the	O
ARGUS	O
text	O
of	O
macro	O
“	O
macroname	O
”	O
at	O
that	O
point	O
.	O
</s>
<s>
The	O
Honeywell	B-Device
1800	I-Device
had	O
an	O
optional	O
Floating	B-Algorithm
Point	I-Algorithm
Adaptor	O
for	O
scientific	O
computing	O
.	O
</s>
<s>
The	O
ARGUS	O
floating	B-Algorithm
point	I-Algorithm
commands	O
were	O
the	O
same	O
regardless	O
of	O
whether	O
there	O
was	O
an	O
adaptor	O
.	O
</s>
<s>
In	O
its	O
absence	O
,	O
ARGUS	O
would	O
supply	O
a	O
machine	O
language	O
simulation	O
of	O
true	O
floating	B-Algorithm
point	I-Algorithm
operation	O
.	O
</s>
