<s>
MACRO-10	B-Language
is	O
an	O
assembly	B-Language
language	I-Language
with	O
extensive	O
macro	O
facilities	O
for	O
DEC	O
's	O
PDP-10-based	O
Mainframe	B-Architecture
computer	I-Architecture
systems	O
,	O
the	O
DECsystem-10	B-Device
and	O
the	O
DECSYSTEM-20	B-Device
.	O
</s>
<s>
MACRO-10	B-Language
is	O
implemented	O
as	O
a	O
two-pass	O
assembler	B-Language
.	O
</s>
<s>
program	O
in	O
MACRO-10	B-Language
assembler	B-Language
,	O
to	O
run	O
under	O
TOPS-10	B-Operating_System
,	O
adapted	O
from	O
a	O
specimen	O
in	O
a	O
large	O
collection	O
of	O
"	O
Hello	O
World	O
"	O
programs	O
in	O
various	O
languages	O
:	O
</s>
<s>
If	O
this	O
program	O
is	O
saved	O
in	O
the	O
file	O
,	O
it	O
can	O
be	O
assembled	O
,	O
linked	O
and	O
run	O
like	O
this	O
(	O
the	O
TOPS-10	B-Operating_System
system	O
prompt	O
is	O
the	O
.	O
</s>
<s>
The	O
date	O
"	O
:9	O
"	O
is	O
a	O
Year	B-Error_Name
2000	I-Error_Name
problem	I-Error_Name
.	O
</s>
<s>
A	O
more	O
complex	O
MACRO-10	B-Language
example	O
program	O
,	O
which	O
renders	O
one	O
version	O
of	O
the	O
99	O
Bottles	O
of	O
Beer	O
song	O
,	O
may	O
be	O
examined	O
at	O
the	O
"	O
99	O
Bottles	O
of	O
Beer	O
"	O
web	O
site	O
.	O
</s>
<s>
For	O
larger	O
bodies	O
of	O
code	O
,	O
much	O
of	O
the	O
MACRO-10	B-Language
code	O
for	O
the	O
TOPS-10	B-Operating_System
and	O
TOPS-20	O
systems	O
is	O
available	O
in	O
the	O
Trailing	O
Edge	O
PDP-10	B-Device
tape	O
archives	O
.	O
</s>
