<s>
The	O
HP-67	B-Device
is	O
a	O
magnetic	O
card-programmable	O
handheld	O
calculator	O
,	O
introduced	O
by	O
Hewlett-Packard	O
in	O
1976	O
at	O
an	O
MSRP	O
of	O
$450	O
.	O
</s>
<s>
Marketed	O
as	O
improved	O
successors	O
to	O
the	O
HP-65	B-Device
,	O
the	O
HP-67/97	O
were	O
based	O
on	O
the	O
technology	O
of	O
the	O
"	O
20-series	O
"	O
of	O
calculators	O
(	O
HP-25	B-Device
,	O
HP-19C	B-Device
etc	O
.	O
)	O
</s>
<s>
The	O
HP-67/97	O
series	O
featured	O
a	O
program	O
memory	O
of	O
224	O
eight-bit	O
words	O
.	O
</s>
<s>
The	O
two	O
extra	O
bits	O
per	O
word	O
compared	O
to	O
the	O
HP-65	B-Device
'	O
s	O
six	O
allowed	O
the	O
designers	O
to	O
store	O
any	O
program	O
instruction	O
in	O
a	O
single	O
memory	O
cell	O
(	O
"	O
fully	O
merged	O
keycodes	O
"	O
)	O
even	O
if	O
it	O
required	O
multiple	O
keystrokes	O
to	O
enter	O
.	O
</s>
<s>
The	O
HP-67	B-Device
keys	O
carry	O
up	O
to	O
four	O
functions	O
each	O
,	O
accessed	O
through	O
"	O
f	O
"	O
,	O
"	O
g	O
"	O
and	O
"	O
h	O
"	O
prefix	O
keys	O
(	O
gold	O
,	O
blue	O
and	O
black	O
labels	O
,	O
respectively	O
)	O
.	O
</s>
<s>
When	O
interchanging	O
magnetic	O
cards	O
between	O
the	O
HP-67	B-Device
and	O
the	O
HP-97	O
,	O
the	O
calculators	O
 '	O
software	O
took	O
care	O
of	O
converting	O
the	O
key	O
codes	O
,	O
and	O
emulated	O
the	O
97	O
's	O
print	O
functions	O
through	O
the	O
67	O
's	O
display	O
.	O
</s>
<s>
The	O
HP-67	B-Device
is	O
powered	O
by	O
a	O
pack	O
of	O
three	O
AA-sized	O
nickel-cadmium	O
rechargeable	O
batteries	O
.	O
</s>
<s>
The	O
same	O
magnetic	O
card	O
format	O
was	O
later	O
used	O
for	O
the	O
HP-41C	B-Device
which	O
offered	O
compatibility	O
to	O
the	O
67/97	O
through	O
software	O
in	O
the	O
card	O
reader	O
.	O
</s>
<s>
In	O
addition	O
to	O
software	O
and	O
support	O
from	O
HP	O
,	O
an	O
active	O
user	O
community	O
supported	O
the	O
HP-67/97	O
as	O
well	O
as	O
the	O
other	O
HP	O
programmables	O
of	O
the	O
era	O
.	O
</s>
<s>
The	O
group	O
was	O
called	O
PPC	B-Application
and	O
produced	O
the	O
PPC	B-Application
Journal	O
.	O
</s>
