<s>
The	O
GE/PAC	B-Device
4000	I-Device
computer	O
systems	O
are	O
an	O
obsolete	O
line	O
of	O
computers	O
manufactured	O
by	O
General	O
Electric	O
in	O
Phoenix	O
,	O
Arizona	O
beginning	O
in	O
the	O
1960s	O
.	O
</s>
<s>
All	O
4000	O
systems	O
are	O
24-bit	O
,	O
using	O
fixed-point	O
binary	O
data	O
,	O
with	O
between	O
1020	O
and	O
65,536	O
words	O
of	O
magnetic	O
core	O
memory	O
,	O
and	O
a	O
magnetic	B-General_Concept
drum	I-General_Concept
memory	I-General_Concept
with	O
8192	O
to	O
262,144	O
word	O
capacity	O
.	O
</s>
<s>
The	O
CPU	O
logic	O
is	O
implemented	O
with	O
discrete	O
transistors	B-Application
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
4000	O
series	O
is	O
called	O
"	O
G-E-MONITOR	O
"	O
,	O
a	O
"	O
skeleton	O
real-time	O
system	O
program.	O
"	O
</s>
