<s>
WATIAC	B-Device
was	O
a	O
virtual	O
computer	O
developed	O
for	O
teaching	O
the	O
principles	O
of	O
assembly	B-Language
language	I-Language
programming	O
to	O
undergraduates	O
.	O
</s>
<s>
WATIAC	B-Device
,	O
and	O
the	O
WATMAP	O
assembly	B-Language
language	I-Language
that	O
ran	O
on	O
it	O
were	O
developed	O
in	O
1973	O
by	O
the	O
newly	O
founded	O
Computer	O
Systems	O
Group	O
,	O
</s>
<s>
In	O
the	O
1970s	O
most	O
programming	O
was	O
conducted	O
through	O
batch	B-General_Concept
stream	I-General_Concept
processing	I-General_Concept
,	O
where	O
the	O
operating	O
systems	O
of	O
the	O
day	O
,	O
like	O
IBM`s	O
OS-360	B-Application
,	O
would	O
allow	O
a	O
single	O
program	O
to	O
use	O
all	O
the	O
resources	O
of	O
a	O
large	O
computer	O
,	O
for	O
a	O
limited	O
period	O
of	O
time	O
.	O
</s>
<s>
Waterloo	O
had	O
been	O
a	O
leader	O
in	O
writing	O
single	O
pass	O
,	O
compile-and-go	O
teaching	O
compilers	O
,	O
with	O
first	O
its	O
WATFOR	B-Language
FORTRAN	B-Application
compiler	O
,	O
and	O
its	O
WATBOL	B-Application
COBOL	B-Application
compiler	O
.	O
</s>
