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HP HP-67 - Page 228

HP HP-67
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224
Using
the
I-Register
for
Indirect
Control
B)
(B5Z(@,
when
the
number
in
the
I-register
is
O
through
25,
de-
crements
(subtracts
1
from)
the
contents
of
the
primary
or
secondary
storage
register
addressed
by
the
current
number
in
the
I-register.
In
arunning
program,
one
step
is
skipped
if
the
contents
of
the
addressed
register
are
then
zero.
(@,
when
the
number
in
the
I-register
is
0
or
a
positive
1
through
19,
transfers
execution
of
a
running
program
sequentially
downward
through
program
memory
to
the
next
label
specified
by
the
current
number
in
the
I-register.
(@,
when
the
number
in
the
I-register
is
a
negative
number
between
—1
and
—999,
transfers
execution of
a
running
program
back
in
program
memory
the
number
of
steps
specified
by
the
current
negative
number
in
the
I-register.
0
(@,
when
the
number
in
the
I-register
is
O
through
19,
transfers
execution of
a
running
program
to
the
subroutine
specified
by
the
current
number
in
the
I-register.
Like
a
normal
subroutine,
when
a
is
then
encountered,
execution
transfers
forward
and
continues
with
the
step
following
the
[@
instruction.
G
(@,
when
the
number
in
the
I-register
is
a
negative
number
between
—1
and
—999,
transfers
execution of
a
running
program
back
in
program
memory
the
number
of
steps
specified
by
the
current
negative
number
in
the
I-register.
Execution
from
that
point
is
like
a
normal
subroutine,
so
if
a
instruction
is
then
encountered,
execution
is
transferred
once
again,
this
time
to
the
next
instruction
after
the
@.
If
the
number
in
the
I-register
is
outside
the
specified
limits
when
the
calculator
attempts
to
execute
one
of
these operations,
the
display
will
show
.
When
using
[,
£5Z(),
or
(5Z
(),
the
calculator
uses
for
an
address
only
the
integer
portion
of
the
number
currently
stored
in
the
I-register.
Thus,
25.99998785
stored
in
the
I-register
retains
its
full
value
there,
but
when
used
as
address
(@,
it
is
read
as
25
by
the
calculator.
In
all
cases
using
the
[
(indirect)
function,
the
HP-67
looks
at
only
the
integer
portion
of
the
current
number
stored
in
the
I-register.

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