<s>
The	O
Electrologica	B-Device
X1	I-Device
was	O
a	O
digital	O
computer	O
designed	O
and	O
manufactured	O
in	O
the	O
Netherlands	O
from	O
1958	O
to	O
1965	O
.	O
</s>
<s>
It	O
was	O
one	O
of	O
the	O
first	O
European	O
computers	O
to	O
have	O
an	O
interrupt	B-Application
facility	O
.	O
</s>
<s>
The	O
X1	O
was	O
the	O
subject	O
of	O
Edsger	O
Dijkstra	O
's	O
Ph.D.	O
dissertation	O
,	O
and	O
the	O
target	O
of	O
the	O
first	O
complete	O
working	O
ALGOL	B-Language
60	I-Language
compiler	O
,	O
completed	O
by	O
Dijkstra	O
and	O
Jaap	O
Zonneveld	O
.	O
</s>
<s>
In	O
1965	O
,	O
the	O
X1	O
was	O
superseded	O
by	O
the	O
X8	B-Device
.	O
</s>
<s>
A	O
similar	O
capability	O
existed	O
in	O
the	O
Zuse	B-Device
Z22	I-Device
and	O
the	O
ZEBRA	B-Device
,	O
and	O
much	O
later	O
in	O
the	O
ARM	B-Architecture
architecture	I-Architecture
.	O
</s>
<s>
The	O
X1	O
included	O
a	O
simple	O
assembler	O
in	O
its	O
read-only	B-General_Concept
memory	I-General_Concept
.	O
</s>
