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HP HP-11C User Manual

HP HP-11C
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130
Section
9:
The
Index
Register
'
Indirect
Index
Register
Functions
Indirect
Index
register
functions
do
not
affect
the
contents
of
Rj.
Instead,
they
use
the
nnnnn
(integer)
portion
of
the
number
stored
in
R;
as
an
address
for
determining
where
in
memory
to
execute
the
function.
Indirect
functions
are
frequently
used
in
conjunction
with
or in
programs
when
it
is
desirable
to
use
the
same
program
instruction
repeatedly
to
sequentially
address
storage
registers,
branches,
or
subroutines.
Indirect
Storage
and
Recall.
((i)))
and
((i))*
store
or
recall
numbers
using
the
data
storage
register
addressed
by
the
absolute
value
of
nnnnn.
For
addressing
R
through
Ry,
nnnnn
=
0
through
9;
for
R
;
through
R4y,
nnnnn
=
10
through
19;
for
R,
nnnnn
=
20.
(Refer
to
the
Indirect
Addressing
table
on
the
following
page.)
Exchange
X,
Indirect.
exchanges
the
contents
of
the
X-register
with
the
contents
of
the
storage
register
addressed
by
the
absolute
value
of
nnnnn.
Indirect
Storage
Register
Arithmetic.
(STO]([+],
(-],
[x],
or
[2])
((i))
performs
storage
register
arithmetic
on
the
contents
of
the
storage
register
addressed
by
the
absolute
value
of
nnnnn.
Examples
If
5.01202
is
stored
in
the Index
register:
nnnnn=5
xxx=012
yy=02
(sTo](]
=
(sT0]5
(f)(x=()]
=
Exchange
X-register
and
Rg
Contents
(sTol(J@)
=
[sTol(+]5
Indirect
Branching
to
Label
or
Line
Number.
In
a
running
program:
1.
If
nnnnnis
=
0,
(1]
branches
execution
downward
in
program
memory
to
the
next
label
specified
by
nnnnn.
*
Refer
to
page
127,
(1)
and
((i))
Abbreviated
Key
Sequences.

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HP HP-11C Specifications

General IconGeneral
BrandHP
ModelHP-11C
CategoryCalculator
LanguageEnglish

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