<s>
The	O
HP-71B	B-Device
was	O
a	O
hand-held	O
computer	O
or	O
calculator	O
programmable	O
in	O
BASIC	O
,	O
made	O
by	O
Hewlett-Packard	O
from	O
1984	O
to	O
1989	O
.	O
</s>
<s>
Smaller	O
and	O
less	O
expensive	O
(	O
US$595	O
MSRP	O
)	O
than	O
the	O
preceding	O
model	O
HP-75	B-Device
,	O
the	O
71B	O
had	O
a	O
single-line	O
22-character	O
liquid	B-Device
crystal	I-Device
display	I-Device
,	O
64K	O
system	O
ROM	O
and	O
17.5K	O
user	O
memory	O
.	O
</s>
<s>
It	O
operated	O
on	O
four	O
AAA	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
Separate	O
compartments	O
could	O
accommodate	O
an	O
optional	O
magnetic	O
card	O
reader	O
and	O
an	O
optional	O
HP-IL	B-Architecture
interface	O
(	O
HP	O
82401A	O
)	O
that	O
could	O
be	O
used	O
to	O
connect	O
printers	O
,	O
storage	O
and	O
electronic	O
test	O
equipment	O
.	O
</s>
<s>
It	O
was	O
also	O
HP	O
's	O
first	O
calculator	O
based	O
on	O
the	O
Saturn	B-Application
processor	I-Application
,	O
later	O
versions	O
of	O
which	O
are	O
found	O
in	O
the	O
popular	O
HP-48	B-Device
series	I-Device
calculators	O
and	O
most	O
more	O
recent	O
HP	B-Device
calculator	I-Device
models	O
.	O
</s>
<s>
Since	O
the	O
hand-pulled	O
magnetic	O
cards	O
(	O
HP-75	B-Device
compatible	O
)	O
could	O
only	O
store	O
two	O
tracks	O
of	O
650	O
bytes	O
each	O
,	O
the	O
card	O
reader	O
(	O
installed	O
under	O
the	O
logo	O
plate	O
above	O
the	O
numeric	O
keyboard	O
)	O
was	O
not	O
a	O
very	O
popular	O
option	O
.	O
</s>
<s>
Larger	O
storage	O
capacities	O
could	O
be	O
accommodated	O
through	O
HP-IL	B-Architecture
peripherals	O
such	O
as	O
the	O
82161A	O
cassette	O
drive	O
or	O
9114A	O
diskette	B-Device
drive	O
that	O
were	O
also	O
battery-powered	O
and	O
portable	O
,	O
if	O
rather	O
bulky	O
compared	O
to	O
the	O
71B	O
.	O
</s>
<s>
Unlike	O
HP-75	B-Device
or	O
HP-41	B-Device
,	O
the	O
71B	O
could	O
also	O
act	O
as	O
a	O
device	O
in	O
a	O
HP-IL	B-Architecture
loop	O
controlled	O
by	O
another	O
device	O
,	O
allowing	O
several	O
of	O
them	O
in	O
the	O
same	O
loop	O
,	O
communicating	O
with	O
each	O
other	O
(	O
or	O
an	O
HP-75	B-Device
or	O
HP-41	B-Device
)	O
or	O
sharing	O
peripherals	O
.	O
</s>
<s>
Using	O
an	O
HP	O
82402	O
Dual	O
HP-IL	B-Architecture
controller	O
,	O
it	O
was	O
even	O
possible	O
to	O
connect	O
one	O
71B	O
to	O
two	O
HP-IL	B-Architecture
loops	O
simultaneously	O
,	O
possibly	O
as	O
a	O
controller	O
in	O
one	O
and	O
as	O
a	O
device	O
in	O
another	O
.	O
</s>
<s>
The	O
HP-71B	B-Device
could	O
optionally	O
be	O
made	O
compatible	O
with	O
the	O
large	O
volume	O
of	O
programs	O
written	O
for	O
the	O
HP-41	B-Device
series	O
of	O
calculators	O
via	O
a	O
plug-in	O
ROM	O
that	O
emulated	O
the	O
HP-41	B-Device
at	O
about	O
5x	O
the	O
original	O
speed	O
.	O
</s>
<s>
Other	O
IDSes	O
were	O
released	O
covering	O
the	O
71B	O
's	O
hardware	O
,	O
the	O
Forth/Assembler	O
add-in	O
ROM	O
,	O
and	O
the	O
add-in	O
HP-IL	B-Architecture
controller	O
.	O
</s>
