<s>
The	O
IBM	B-Device
8000	I-Device
series	O
was	O
a	O
proposed	O
transistor-based	B-Device
successor	O
to	O
the	O
IBM	B-Device
7000	I-Device
series	I-Device
.	O
</s>
<s>
The	O
project	O
was	O
canceled	O
in	O
1961	O
by	O
Bob	O
Evans	O
,	O
supplanted	O
by	O
the	O
successful	O
System/360	B-Application
series	O
.	O
</s>
<s>
The	O
8000	O
project	O
may	O
have	O
seen	O
the	O
first	O
use	O
of	O
the	O
term	O
"	O
architecture	B-General_Concept
"	O
in	O
relation	O
to	O
computers	O
.	O
</s>
<s>
The	O
proposed	O
systems	O
would	O
have	O
been	O
incompatible	O
with	O
IBM	O
's	O
existing	O
successful	O
1400	B-Device
series	I-Device
systems	O
.	O
</s>
<s>
The	O
proposed	O
instruction	B-General_Concept
set	I-General_Concept
was	O
too	O
complex	O
.	O
</s>
<s>
Unlike	O
System/360	B-Application
,	O
which	O
offered	O
a	O
series	O
of	O
processors	O
with	O
a	O
common	O
architecture	B-General_Concept
,	O
the	O
8000	O
was	O
designed	O
with	O
a	O
single	O
main	O
processor	O
to	O
which	O
external	O
components	O
could	O
be	O
added	O
to	O
increase	O
performance	O
.	O
</s>
<s>
Memory	O
was	O
organized	O
into	O
segments	B-General_Concept
;	O
segment	O
size	O
is	O
unspecified	O
in	O
the	O
proposal	O
.	O
</s>
<s>
The	O
8103	O
was	O
to	O
be	O
multiprogrammed	O
to	O
support	O
its	O
mission	O
as	O
an	O
input/output	O
or	O
front	B-General_Concept
end	I-General_Concept
processor	I-General_Concept
.	O
</s>
<s>
The	O
8104	O
supported	O
direct	O
addressing	O
,	O
indirect	O
addressing	O
,	O
and	O
indexed	O
addressing	O
with	O
255	O
index	B-General_Concept
registers	I-General_Concept
.	O
</s>
<s>
The	O
8106	O
was	O
to	O
have	O
been	O
the	O
principal	O
processor	O
in	O
the	O
8000	O
line	O
,	O
designed	O
to	O
bracket	O
the	O
performance	O
of	O
the	O
IBM	B-Device
7090	I-Device
system	O
.	O
</s>
<s>
The	O
system	O
used	O
nonpaged	O
virtual	B-Architecture
memory	I-Architecture
,	O
addressing	O
blocks	O
of	O
256	O
words	O
through	O
an	O
address	O
translation	O
table	O
.	O
</s>
