<s>
OS/6	O
(	O
Office	O
System/6	O
or	O
System	O
6	O
)	O
is	O
a	O
standalone	O
word	B-General_Concept
processor	I-General_Concept
made	O
by	O
IBM	O
's	O
Office	O
Products	O
Division	O
(	O
OPD	O
)	O
,	O
introduced	O
in	O
January	O
,	O
1977	O
.	O
</s>
<s>
OS/6	O
was	O
superseded	O
by	O
the	O
IBM	B-Protocol
Displaywriter	I-Protocol
in	O
1980	O
.	O
</s>
<s>
The	O
intended	O
configuration	O
is	O
a	O
console	O
with	O
a	O
keyboard	O
,	O
a	O
small	O
,	O
approximately	O
9	O
"	O
CRT	B-Device
character	O
display	O
and	O
either	O
a	O
daisy	O
wheel	O
or	O
IBM	O
46/40	O
ink	O
jet	O
printer	O
,	O
renamed	O
the	O
IBM	O
6640	O
.	O
</s>
<s>
Documents	O
are	O
stored	O
on	O
8-inch	B-Device
floppy	I-Device
diskettes	B-Device
and	O
magnetic	O
stripe	O
card	O
,	O
which	O
is	O
exchangeable	O
with	O
IBM	O
's	O
previous	O
generation	O
of	O
Mag	O
Card	O
Selectrics	O
.	O
</s>
<s>
The	O
display	O
is	O
pre-WYSIWYG	O
,	O
so	O
special	O
symbols	O
embedded	O
in	O
the	O
displayed	O
text	O
mark	O
formatting	O
information	O
the	O
user	O
can	O
edit	O
.	O
</s>
<s>
It	O
includes	O
features	O
like	O
mail	B-Application
merge	I-Application
,	O
very	O
high	O
print	O
quality	O
with	O
many	O
formatting	O
options	O
and	O
printers	O
that	O
can	O
feed	O
envelopes	O
or	O
sheets	O
from	O
two	O
drawers	O
,	O
usually	O
referred	O
to	O
within	O
IBM	O
as	O
letterhead	O
and	O
second	O
sheet	O
.	O
</s>
<s>
Data	O
from	O
Office	O
System/6	O
can	O
be	O
migrated	O
to	O
IBM	B-Device
5110	I-Device
and	O
5120	B-Device
with	O
third-party	O
applications	O
.	O
</s>
<s>
Internally	O
,	O
the	O
OS/6	O
uses	O
an	O
IBM	O
proprietary	O
16-bit	B-Device
single-chip	O
microprocessor	B-Architecture
called	O
the	O
OPD	B-Device
Mini	I-Device
Processor	I-Device
.	O
</s>
<s>
This	O
processor	O
is	O
a	O
single-chip	O
FET	B-Application
microprocessor	B-Architecture
designed	O
by	O
Richard	O
Vrba	O
.	O
</s>
<s>
It	O
had	O
a	O
16-bit	B-Device
little-endian	O
instruction	B-General_Concept
set	I-General_Concept
built	O
on	O
an	O
8-bit	O
internal	B-General_Concept
architecture	I-General_Concept
.	O
</s>
<s>
Sixteen	O
general-purpose	O
registers	B-General_Concept
,	O
implemented	O
as	O
a	O
32-byte	O
window	B-General_Concept
in	O
memory	O
that	O
operated	O
as	O
a	O
stack	B-Application
,	O
could	O
be	O
used	O
as	O
instruction	O
operands	O
or	O
for	O
indirect	O
references	O
to	O
operands	O
in	O
memory	O
.	O
</s>
<s>
System	O
6	O
building	O
blocks	O
are	O
monitor	O
,	O
keyboard	O
,	O
magnetic	O
card	O
unit	O
,	O
inkjet	O
,	O
and	O
daisy	O
wheel	O
printers	O
,	O
and	O
a	O
floppy	B-Device
disk	I-Device
station	O
.	O
</s>
<s>
In	O
1979	O
,	O
a	O
communication-enabled	O
laser	O
printer	O
and	O
photocopier	O
combination	O
was	O
introduced	O
,	O
the	O
IBM	B-Device
6670	I-Device
Information	O
Distributor	O
.	O
</s>
<s>
Also	O
in	O
1979	O
,	O
IBM	O
General	O
Systems	O
Division	O
(	O
GSD	O
)	O
introduced	O
IBM	B-Device
5520	I-Device
systems	O
,	O
not	O
related	O
to	O
System	O
6	O
,	O
with	O
some	O
overlapping	O
functionality	O
and	O
performance	O
.	O
</s>
<s>
OS/6	O
was	O
superseded	O
by	O
the	O
IBM	B-Protocol
Displaywriter	I-Protocol
in	O
1980	O
.	O
</s>
