<s>
The	O
GE-200	B-Device
series	I-Device
was	O
a	O
family	O
of	O
small	O
mainframe	B-Architecture
computers	I-Architecture
of	O
the	O
1960s	O
,	O
built	O
by	O
General	O
Electric	O
(	O
GE	O
)	O
.	O
</s>
<s>
The	O
main	O
machine	O
in	O
the	O
line	O
was	O
the	O
GE-225	B-Device
(	O
1961	O
)	O
.	O
</s>
<s>
It	O
used	O
a	O
20-bit	O
word	O
,	O
of	O
which	O
13	O
bits	O
could	O
be	O
used	O
for	O
an	O
address	B-General_Concept
.	O
</s>
<s>
Along	O
with	O
the	O
basic	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
the	O
system	O
could	O
also	O
have	O
had	O
a	O
floating-point	B-General_Concept
unit	I-General_Concept
(	O
the	O
"	O
Auxiliary	O
Arithmetic	O
Unit	O
"	O
)	O
,	O
or	O
a	O
fixed-point	O
decimal	O
option	O
with	O
three	O
six-bit	O
decimal	O
digits	O
per	O
word	O
.	O
</s>
<s>
It	O
had	O
eleven	O
I/O	B-Device
channel	I-Device
controllers	O
,	O
and	O
GE	O
sold	O
a	O
variety	O
of	O
add-ons	O
including	O
disks	O
,	O
printers	O
,	O
and	O
other	O
devices	O
.	O
</s>
<s>
The	O
GE-215	O
(	O
1963	O
)	O
was	O
a	O
scaled-down	O
version	O
of	O
the	O
GE-225	B-Device
,	O
including	O
only	O
six	O
I/O	B-Device
channels	I-Device
and	O
only	O
4	O
kilowords	O
or	O
8	O
kilowords	O
of	O
core	O
.	O
</s>
<s>
The	O
GE-235	O
(	O
1964	O
)	O
was	O
a	O
re-implementation	O
of	O
the	O
GE-225	B-Device
with	O
three	O
times	O
faster	O
memory	O
than	O
the	O
original	O
.	O
</s>
<s>
Oldfield	O
,	O
somewhat	O
deceptively	O
,	O
claimed	O
that	O
the	O
GE-200	B-Device
series	I-Device
would	O
be	O
industrial	O
control	O
computers	O
.	O
</s>
<s>
Through	O
the	O
early	O
1960s	O
GE	O
worked	O
with	O
Dartmouth	O
College	O
on	O
the	O
development	O
of	O
a	O
time-sharing	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
,	O
which	O
would	O
later	O
go	O
on	O
to	O
become	O
the	O
Dartmouth	B-Operating_System
Time	I-Operating_System
Sharing	I-Operating_System
System	I-Operating_System
(	O
DTSS	O
)	O
.	O
</s>
<s>
The	O
system	O
was	O
constructed	O
by	O
attaching	O
a	O
number	O
of	O
teletypewriters	O
to	O
a	O
smaller	O
GE	O
machine	O
called	O
the	O
DATANET-30	B-Device
(	O
DN-30	O
)	O
,	O
which	O
was	O
a	O
small	O
computer	O
that	O
had	O
evolved	O
from	O
an	O
earlier	O
process-control	O
machine	O
.	O
</s>
<s>
The	O
GE-235	O
had	O
no	O
idea	O
it	O
was	O
not	O
running	O
in	O
batch	B-General_Concept
mode	I-General_Concept
,	O
and	O
the	O
illusion	O
of	O
multitasking	B-Operating_System
was	O
being	O
maintained	O
externally	O
.	O
</s>
<s>
The	O
GE-265	O
achieved	O
fame	O
not	O
only	O
for	O
being	O
the	O
first	O
commercially	O
successful	O
time-sharing	B-General_Concept
system	I-General_Concept
,	O
but	O
it	O
was	O
also	O
the	O
machine	O
on	O
which	O
the	O
BASIC	O
programming	O
language	O
was	O
first	O
created	O
.	O
</s>
