<s>
The	O
Mouse	B-Language
programming	I-Language
language	I-Language
is	O
a	O
small	O
computer	O
programming	O
language	O
developed	O
by	O
Dr.	O
Peter	O
Grogono	O
in	O
the	O
late	O
1970s	O
and	O
early	O
1980s	O
.	O
</s>
<s>
Mouse	O
was	O
originally	O
intended	O
as	O
a	O
small	O
,	O
efficient	O
language	O
for	O
microcomputers	B-Architecture
with	O
limited	O
memory	O
.	O
</s>
<s>
It	O
is	O
an	O
interpreted	O
,	O
stack-based	O
language	O
and	O
uses	O
Reverse	O
Polish	O
notation	O
.	O
</s>
<s>
Much	O
of	O
the	O
book	O
describing	O
Mouse	O
is	O
devoted	O
to	O
describing	O
the	O
implementation	O
of	O
two	O
interpreters	O
,	O
one	O
in	O
Z80	B-General_Concept
assembly	B-Language
language	I-Language
,	O
the	O
other	O
in	O
Pascal	B-Application
.	O
</s>
<s>
Here	O
X	O
refers	O
to	O
the	O
number	O
on	O
the	O
top	O
of	O
the	O
stack	B-Application
,	O
and	O
Y	O
is	O
the	O
next	O
number	O
on	O
the	O
stack	B-Application
.	O
</s>
<s>
Symbol	O
Action	O
<space> No action $ End of program <number> Push <number>	O
onto	O
stack	B-Application
+	O
Add	O
-	O
Subtract	O
*	O
Multiply	O
/	O
Integer	O
divide	O
\	O
Remainder	O
?	O
</s>
<s>
Print	O
character	O
'	O
Push	O
character	O
onto	O
stack	B-Application
"	O
Print	O
string	O
<letter>	O
Get	O
variable	O
address	O
:	O
Store	O
variable	O
.	O
</s>
<s>
Macro	O
A	O
in	O
this	O
example	O
adds	O
the	O
two	O
parameters	O
passed	O
to	O
it	O
from	O
the	O
main	O
program	O
,	O
and	O
returns	O
the	O
sum	O
on	O
the	O
top	O
of	O
the	O
stack	B-Application
.	O
</s>
