<s>
The	O
HP-27S	B-Device
was	O
a	O
pocket	O
calculator	O
produced	O
by	O
Hewlett-Packard	O
,	O
introduced	O
in	O
1988	O
,	O
and	O
discontinued	O
between	O
1990	O
and	O
1993	O
(	O
sources	O
vary	O
)	O
.	O
</s>
<s>
Business	O
features	O
included	O
a	O
real-time	O
clock	O
and	O
calendar	B-Application
with	O
up	O
to	O
ten	O
appointments	O
(	O
each	O
with	O
a	O
22	O
character	O
message	O
string	O
)	O
,	O
as	O
well	O
as	O
functions	O
such	O
as	O
time	O
value	O
of	O
money	O
calculations	O
.	O
</s>
<s>
The	O
27S	O
was	O
not	O
programmable	B-Application
in	O
the	O
conventional	O
way	O
,	O
but	O
it	O
included	O
an	O
advanced	O
formula-storage	O
system	O
with	O
programming	O
features	O
.	O
</s>
<s>
Introduced	O
at	O
the	O
same	O
time	O
as	O
the	O
HP-17B	B-Device
,	O
it	O
shares	O
the	O
same	O
internal	O
hardware	O
.	O
</s>
<s>
Its	O
hardware	O
features	O
included	O
a	O
dot-matrix	B-General_Concept
display	I-General_Concept
of	O
two	O
rows	O
of	O
22	O
characters	O
.	O
</s>
