<s>
The	O
Hewlett-Packard	O
Voyager	O
series	O
of	O
calculators	B-Application
were	O
introduced	O
by	O
Hewlett-Packard	O
in	O
1981	O
.	O
</s>
<s>
All	O
members	O
of	O
this	O
series	O
are	O
programmable	B-Application
,	O
use	O
Reverse	O
Polish	O
Notation	O
,	O
and	O
feature	O
continuous	B-Device
memory	I-Device
.	O
</s>
<s>
The	O
HP	B-Device
calculators	I-Device
Voyager	O
series	O
consisted	O
of	O
five	O
models	O
,	O
some	O
of	O
which	O
were	O
manufactured	O
in	O
several	O
variants	O
(	O
with	O
years	O
of	O
production	O
)	O
:	O
</s>
<s>
HP-10C	O
basic	O
scientific	O
calculator	B-Application
(	O
1982	O
–	O
1984	O
)	O
.	O
</s>
<s>
HP-11C	B-Device
mid-range	O
scientific	O
calculator	B-Application
(	O
1981	O
–	O
1989	O
)	O
.	O
</s>
<s>
HP-12C	B-Device
business/financial	O
calculator	B-Application
(	O
1981	O
–	O
present	O
)	O
.	O
</s>
<s>
HP-15C	B-Device
advanced	O
scientific	O
calculator	B-Application
(	O
1982	O
–	O
1989	O
,	O
2011	O
)	O
.	O
</s>
<s>
HP-16C	O
computer	B-Application
programmer	I-Application
's	O
calculator	B-Application
(	O
1982	O
–	O
1989	O
)	O
.	O
</s>
<s>
The	O
HP-10C	O
is	O
the	O
last	O
and	O
lowest-featured	O
calculator	B-Application
in	O
this	O
line	O
,	O
even	O
though	O
its	O
number	O
would	O
suggest	O
an	O
earlier	O
origin	O
.	O
</s>
<s>
The	O
10C	O
was	O
a	O
basic	O
scientific	O
programmable	B-Application
calculator	I-Application
.	O
</s>
<s>
While	O
a	O
useful	O
general	O
purpose	O
RPN	O
calculator	B-Application
,	O
the	O
HP-11C	B-Device
offered	O
twice	O
as	O
much	O
for	O
only	O
a	O
slight	O
increase	O
in	O
price	O
.	O
</s>
<s>
Designed	O
to	O
be	O
an	O
introductory	O
calculator	B-Application
,	O
it	O
was	O
still	O
costly	O
compared	O
to	O
the	O
competition	O
,	O
and	O
many	O
looking	O
at	O
an	O
HP	O
would	O
just	O
step	O
up	O
to	O
the	O
better	O
HP-11C	B-Device
.	O
</s>
<s>
The	O
HP-11C	B-Device
is	O
a	O
mid-range	O
scientific	O
programmable	B-Application
calculator	I-Application
.	O
</s>
<s>
The	O
HP-12C	B-Device
is	O
a	O
popular	O
financial	O
calculator	B-Application
.	O
</s>
<s>
Over	O
the	O
course	O
of	O
years	O
,	O
several	O
anniversary	O
editions	O
of	O
the	O
calculator	B-Application
were	O
produced	O
as	O
well	O
.	O
</s>
<s>
The	O
HP-12C	B-Device
is	O
HP	O
's	O
longest	O
and	O
best-selling	O
product	O
,	O
in	O
continual	O
production	O
since	O
its	O
introduction	O
in	O
1981	O
.	O
</s>
<s>
The	O
HP-15C	B-Device
is	O
a	O
high-end	O
scientific	O
programmable	B-Application
with	O
a	O
root-solver	O
and	O
numerical	O
integration	O
,	O
produced	O
between	O
1982	O
and	O
1989	O
.	O
</s>
<s>
Although	O
long	O
being	O
discontinued	O
its	O
continued	O
popularity	O
among	O
users	O
triggered	O
Hewlett-Packard	O
to	O
offer	O
a	O
HP	O
15c	O
Limited	O
Edition	O
remake	O
of	O
the	O
calculator	B-Application
in	O
2011	O
.	O
</s>
<s>
The	O
HP-16C	O
is	O
a	O
computer	B-Application
programmer	I-Application
's	O
calculator	B-Application
,	O
designed	O
to	O
assist	O
in	O
debugging	O
.	O
</s>
<s>
A	O
number	O
of	O
specialized	O
functions	O
are	O
provided	O
to	O
assist	O
the	O
programmer	B-Application
,	O
including	O
left	O
-	O
and	O
right-shifting	O
,	O
masking	O
,	O
and	O
bitwise	O
logical	O
operations	O
.	O
</s>
<s>
HP	O
has	O
(	O
as	O
of	O
2015	O
)	O
never	O
made	O
another	O
programmer	B-Application
's	O
calculator	B-Application
,	O
but	O
has	O
incorporated	O
the	O
16C	O
's	O
functions	O
in	O
later	O
calculator	B-Application
models	O
.	O
</s>
<s>
Hewlett-Packard	O
retained	O
the	O
numerical	B-General_Concept
analyst	I-General_Concept
William	O
Kahan	O
of	O
UC	O
Berkeley	O
,	O
the	O
architect	O
of	O
the	O
IEEE	O
754	O
standard	O
for	O
floating-point	B-Algorithm
arithmetic	I-Algorithm
,	O
to	O
design	O
the	O
numerical	B-General_Concept
algorithms	I-General_Concept
implemented	O
by	O
the	O
calculators	B-Application
.	O
</s>
<s>
The	O
HP	O
Voyager	O
series	O
calculator	B-Application
are	O
keystroke	B-Device
programmable	I-Device
,	O
meaning	O
that	O
it	O
can	O
remember	O
and	O
later	O
execute	O
sequences	O
of	O
keystrokes	O
to	O
solve	O
particular	O
problems	O
of	O
interest	O
to	O
the	O
user	O
.	O
</s>
<s>
The	O
available	O
programming	O
features	O
differentiate	O
between	O
the	O
various	O
HP	O
Voyager	O
series	O
calculator	B-Application
systems	O
.	O
</s>
<s>
Function	O
HP-10C	O
HP-11C	B-Device
HP-12C	B-Device
HP-15C	B-Device
HP-16C	O
BSP	O
/	O
←	O
Without	O
BSP	O
(	O
backspace	O
)	O
programs	O
can	O
only	O
be	O
edited	O
by	O
overwriting	O
existing	O
steps	O
.	O
</s>
<s>
Also	O
the	O
programming	O
model	O
is	O
not	O
turing	B-Algorithm
complete	I-Algorithm
.	O
</s>
<s>
The	O
HP-12C	B-Device
and	O
its	O
derivatives	O
remains	O
in	O
widespread	O
use	O
today	O
and	O
is	O
still	O
available	O
from	O
Hewlett-Packard	O
.	O
</s>
<s>
The	O
long-discontinued	O
HP-15C	B-Device
was	O
re-released	O
in	O
a	O
"	O
Limited	O
Edition	O
"	O
in	O
2011	O
that	O
has	O
again	O
been	O
discontinued	O
.	O
</s>
<s>
In	O
2011	O
,	O
the	O
continued	O
popularity	O
of	O
the	O
Voyager	O
series	O
among	O
users	O
prompted	O
SwissMicros	O
to	O
produce	O
a	O
series	O
of	O
credit-card-sized	O
calculators	B-Application
looking	O
like	O
miniature	O
versions	O
of	O
their	O
HP	O
equivalents	O
and	O
running	O
the	O
original	O
HP	O
firmware	O
in	O
an	O
emulator	O
on	O
a	O
modern	O
calculator	B-Application
hardware	O
.	O
</s>
<s>
The	O
series	O
consisted	O
of	O
the	O
DM10	O
,	O
DM11	O
,	O
DM12	B-Device
,	O
DM15	B-Device
and	O
DM16	B-Device
.	O
</s>
<s>
All	O
calculators	B-Application
used	O
the	O
same	O
hardware	O
,	O
but	O
differ	O
in	O
keyboard	O
and	O
firmware	O
(	O
which	O
can	O
be	O
changed	O
with	O
an	O
upgrade	O
port	O
)	O
.	O
</s>
<s>
After	O
the	O
introduction	O
of	O
the	O
larger	O
DM15L	B-Device
,	O
DM41L	B-Device
and	O
DM16L	B-Device
in	O
2015	O
,	O
the	O
DM11L	O
was	O
added	O
in	O
January	O
2016	O
with	O
the	O
DM12L	B-Device
following	O
in	O
February	O
.	O
</s>
