<s>
The	O
HP-67	O
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>
A	O
desktop	O
version	O
with	O
built-in	O
thermal	O
printer	O
was	O
sold	O
as	O
the	O
HP-97	B-Device
at	O
a	O
price	O
of	O
$750	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
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>
When	O
interchanging	O
magnetic	O
cards	O
between	O
the	O
HP-67	O
and	O
the	O
HP-97	B-Device
,	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>
Owing	O
to	O
the	O
power	O
requirements	O
of	O
the	O
built-in	O
thermal	O
printer	O
,	O
the	O
HP-97	B-Device
employs	O
a	O
larger	O
battery	O
pack	O
and	O
more	O
powerful	O
charger	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>
The	O
group	O
was	O
called	O
PPC	B-Application
and	O
produced	O
the	O
PPC	B-Application
Journal	O
.	O
</s>
<s>
In	O
1977	O
,	O
HP	O
introduced	O
an	O
extended	O
version	O
of	O
the	O
desktop	O
model	O
as	O
the	O
HP-97S	B-Device
which	O
featured	O
an	O
extra	O
parallel	O
I/O	O
port	O
(	O
40	O
lines	O
for	O
10	O
4-bit	O
BCD	O
digits	O
,	O
plus	O
5	O
control	O
lines	O
)	O
for	O
collecting	O
data	O
from	O
external	O
hardware	O
,	O
at	O
a	O
price	O
of	O
$	O
1,375	O
.	O
</s>
