<s>
Dartmouth	B-Language
ALGOL	I-Language
30	I-Language
was	O
a	O
1960s-era	O
implementation	O
,	O
first	O
of	O
the	O
ALGOL	B-Language
58	I-Language
programming	I-Language
language	I-Language
and	O
then	O
of	O
ALGOL	B-Language
60	I-Language
.	O
</s>
<s>
It	O
is	O
named	O
after	O
the	O
computer	O
on	O
which	O
it	O
ran	O
:	O
a	O
Librascope	O
General	O
Precision	O
(	O
LGP-30	B-Device
)	O
desk-size	O
computer	O
acquired	O
by	O
Dartmouth	O
College	O
in	O
1959	O
.	O
</s>
<s>
Since	O
the	O
limited	O
size	O
of	O
the	O
LGP-30	B-Device
(	O
4K	O
30-bit	O
words	O
)	O
precluded	O
a	O
full	O
implementation	O
of	O
ALGOL	B-Language
60	I-Language
,	O
certain	O
features	O
(	O
arrays	O
called	O
by	O
value	O
,	O
own	O
arrays	O
,	O
strings	O
,	O
variable	O
array	O
bounds	O
,	O
and	O
recursion	O
)	O
were	O
omitted	O
;	O
but	O
the	O
implementation	O
did	O
include	O
parameters	O
called	O
by	O
name	O
,	O
using	O
thunks	B-Application
and	O
integer	O
labels	O
.	O
</s>
<s>
ALGOL	B-Language
30	O
was	O
implemented	O
by	O
four	O
undergraduate	O
students	O
.	O
</s>
<s>
Robert	O
F	O
.	O
Hargraves	O
,	O
Jorge	O
Llacer	O
,	O
and	O
Anthony	O
W	O
.	O
Knapp	O
developed	O
the	O
run-time	O
system	O
,	O
which	O
included	O
an	O
interpreter	O
for	O
floating-point	B-Algorithm
arithmetic	I-Algorithm
(	O
not	O
supported	O
by	O
the	O
limited	O
instruction	O
set	O
of	O
the	O
LGP-30	B-Device
)	O
.	O
</s>
<s>
ALGOL	B-Language
30	O
was	O
a	O
two-pass	O
system	O
.	O
</s>
<s>
To	O
enable	O
wider	O
use	O
,	O
Garland	O
and	O
Knapp	O
developed	O
a	O
"	O
load-and-go	O
"	O
system	O
known	O
as	O
SCALP	O
,	O
a	O
Self	O
Contained	O
ALgol	B-Language
Processor	O
,	O
for	O
a	O
smaller	O
subset	O
of	O
ALGOL	B-Language
60	I-Language
(	O
which	O
did	O
not	O
allow	O
boolean	O
variables	O
or	O
operators	O
,	O
blocks	O
,	O
procedures	O
,	O
own	O
or	O
dynamic	O
arrays	O
,	O
conditional	O
expressions	O
,	O
and	O
step-until	O
for	O
statements	O
)	O
.	O
</s>
<s>
SCALP	O
devoted	O
a	O
third	O
of	O
the	O
LGP	O
's	O
memory	O
to	O
the	O
compiler	O
,	O
a	O
third	O
to	O
the	O
run-time	O
system	O
(	O
which	O
included	O
a	O
floating-point	B-Algorithm
interpreter	O
and	O
numeric	B-Algorithm
functions	O
)	O
,	O
and	O
a	O
third	O
for	O
compiled	O
user	O
code	O
.	O
</s>
<s>
Hundreds	O
of	O
students	O
used	O
SCALP	O
before	O
BASIC	O
became	O
available	O
on	O
the	O
Dartmouth	B-Operating_System
Time	I-Operating_System
Sharing	I-Operating_System
System	I-Operating_System
in	O
1965	O
.	O
</s>
<s>
ALGOL	B-Language
30	O
was	O
the	O
basis	O
for	O
an	O
implementation	O
in	O
1965	O
of	O
ALGOL	B-Language
60	I-Language
on	O
the	O
Dartmouth	B-Operating_System
Time	I-Operating_System
Sharing	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
Several	O
years	O
later	O
,	O
Sidney	O
Marshall	O
produced	O
an	O
implementation	O
of	O
ALGOL	B-Language
68	O
.	O
</s>
