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HP HP-67 User Manual

HP HP-67
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278
Card
Reader
Operations
When
merging,
the
instructions
that
are
replaced
in
program
memory
by
the
instructions
from
the
magnetic
card
are
lost.
The
entire
program
on
the
card,
of
course,
remains
recorded
there
permanently,
until
another
program
(or
data)
is
recorded
upon
the
card.
Calculator
status
information
(flag,
display
and
trigonometric
modes)
is
not
changed
when
merging
a
new
program
with
the
one
in
program
memory.
Protecting
a
Card
Information
(whether
program
or
data)
that
you
have
recorded
upon
amagnetic
card
can
be
cleared
or
replaced
unless
the
card
is
protected.
To
protect
a
side
of
a
recorded
card,
clip
the
notched
corner
of
the
card
nearest
the
side
you
want
to
protect.
Clip
here
to
protect
side
1.
'
Not
here—you
could
lose
part
of
the
program.
Clip
here
to
protect
side
2.
7
When
you
have
protected
a
recorded
program
or
recorded
data
on
a
side
of
a
card
by
clipping
that
corner
of
the
card,
you
can
load
that
information
into
the
HP-67
any
number
of
times,
but
you
will
not
be
able
to
replace
or
add
to
the
program
or
data
on
the
card.
Marking
a
Card
After
you
have
recorded
a
program on
a
card,
you
will
probably
want
to
assign
the
program
a
name
and
to
mark
the
name
onto
the
card.
In
addition,
you
will
probably
want
to
mark
symbols
onto
the
magnetic
card
so
that
when
the
card
is
inserted
in
the
window
slot,
they
will
appear
above
the
letter
keys
(I3
through
{3
,
(&
through
[&])
associated
with
the
labels
in
the
program.
These
symbols,
or
mnemonics,
should
help
you
remember
the
use of
the
letter
keys
in
the
program,
and
they
will
aid
in
running
the
program.
For
example,
if
you
had
written
a
program
that
would
convert
degrees
Celsius
to
degrees
Fahrenheit
when
was
pressed,
and
degrees
Fahrenheit
to
degrees
Celsius
when
i}
was
pressed,
you
might
wish
to
mark
the
card
with
the
information
as
shown
on
the
following
page.

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HP HP-67 Specifications

General IconGeneral
Introduced1976
Programming Steps224
Memory Registers26
TypeProgrammable
ManufacturerHewlett-Packard (HP)
DisplayLED (red)
ProgrammingKeystroke
PowerRechargeable battery pack
LogicRPN (Reverse Polish Notation)
BatteryRechargeable battery pack

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