<s>
Boeing	B-Application
Calc	I-Application
was	O
a	O
spreadsheet	B-Application
package	O
written	O
by	O
Boeing	O
Computer	O
Services	O
,	O
an	O
independent	O
subsidiary	O
of	O
aviation	O
manufacturer	O
Boeing	O
.	O
</s>
<s>
It	O
had	O
originally	O
been	O
developed	O
as	O
an	O
in-house	O
accounting	O
tool	O
,	O
but	O
was	O
launched	O
as	O
a	O
commercial	O
product	O
in	O
April	O
1985	O
for	O
IBM	B-Device
4300	I-Device
mainframes	O
running	O
IBM	B-Application
MVS	I-Application
and	O
IBM	B-Device
PC	I-Device
microcomputers	O
running	O
DOS	B-Device
.	O
</s>
<s>
Boeing	B-Application
Calc	I-Application
could	O
read	O
and	O
later	O
write	O
standard	O
Lotus	B-Application
1-2-3	I-Application
files	O
.	O
</s>
<s>
It	O
supported	O
a	O
maximum	O
spreadsheet	B-Application
size	O
of	O
16,000	O
columns	O
by	O
16,000	O
rows	O
,	O
and	O
was	O
notable	O
for	O
introducing	O
the	O
concept	O
of	O
3D	O
spreadsheets	B-Application
.	O
</s>
<s>
Each	O
spreadsheet	B-Application
could	O
have	O
up	O
to	O
16,000	O
pages	O
,	O
with	O
cells	O
prefixed	O
by	O
the	O
page	O
number	O
;	O
the	O
upper-left	O
cell	O
of	O
the	O
third	O
page	O
was	O
referred	O
to	O
as	O
3A1	O
,	O
for	O
example	O
.	O
</s>
<s>
This	O
concept	O
was	O
a	O
precursor	O
of	O
the	O
tabbed	O
sheets	O
included	O
in	O
Quattro	B-Application
Pro	I-Application
and	O
later	O
spreadsheets	B-Application
.	O
</s>
<s>
Unlike	O
competitors	O
such	O
as	O
Lotus	B-Application
1-2-3	I-Application
and	O
Quattro	O
it	O
did	O
not	O
support	O
graphics	O
,	O
although	O
Boeing	O
sold	O
a	O
companion	O
program	O
-	O
Boeing	O
Graph	O
-	O
that	O
could	O
produce	O
3D	O
charts	O
.	O
</s>
<s>
Contemporary	O
reviews	O
of	O
version	O
3.0	O
praised	O
Boeing	B-Application
Calc	I-Application
's	O
flexibility	O
and	O
ability	O
to	O
work	O
with	O
files	O
of	O
up	O
to	O
32mb	O
in	O
size	O
,	O
but	O
criticised	O
its	O
steep	O
system	O
requirements	O
,	O
slow	O
speed	O
,	O
and	O
reliance	O
on	O
disk-based	O
virtual	B-Architecture
memory	I-Architecture
.	O
</s>
<s>
Running	O
on	O
a	O
high-end	O
6MHz	O
IBM	B-Operating_System
PC	I-Operating_System
AT	I-Operating_System
with	O
an	O
Intel	B-Device
8087	I-Device
maths	O
coprocessor	O
,	O
Infoworld	O
's	O
standard	O
spreadsheet	B-Application
took	O
42.9	O
seconds	O
to	O
recalculate	O
,	O
versus	O
7.9	O
for	O
the	O
same	O
sheet	O
running	O
in	O
Lotus	B-Application
1-2-3	I-Application
.	O
</s>
<s>
Boeing	B-Application
Calc	I-Application
ceased	O
development	O
in	O
1988	O
,	O
with	O
the	O
final	O
copies	O
being	O
sold	O
off	O
to	O
employees	O
at	O
a	O
discount	O
price	O
of	O
$50	O
.	O
</s>
