Texas Instruments TI Programmable 57

CONDITIONAL TRANSFERS
The
instruction
that
immediately
follows
the
EMI
key
sequence
can
be
anything,
but
you'll
find
a
n
key
sequence
especially
useful,
as
shown
in
the
diagram
below:
Calculator asks,
Is x equal to t?
Next program steps
Again,
key
things
to
remember
when
using
the
El
key
sequence:
The
calculator
asks
the
question:
Is
x
=
t?
*If
the
answer
is
yes
—
it
goes
on
to
the
step
immediately
following.
-If
the
answer
is
no
—
it
SKIPS
the
step
following
and
goes
on.
OTHER CONDITIONAL TRANSFERS:
[INV]
[2nd]
—
“Is
x
Nor
Equat
To
t?”
(x
#
t)
Key
Sequence
This
key
sequence
is
entered
into
a
program
(while
in
learn’
mode)
to
create
a
conditional
program
transfer
(or
decision).
When
the
program
pointer
encounters
the
"Is
x
not
equal
to
t?”
key
sequence
—
[6]
sd)
El
— the
following
things
happen:
-The
calculator
compares
the
contents
of
the
display
register
(x)
to,
the
contents
of
the
test
register
(register
7).
‘The
calculator
asks:
Is
x
not
equal
(or
unequal)
to
t?
+If
the
answeris
yes,
the
program
pointer
goes
right
on
to
the
step
that
immediately
follows.
“If
the
answer
is
no,
the
program
pointer
SKIPS
the
following
step
and
continues,
Again
note
that
the
program
step
immediately
following
the
[i]
(sd)
Ell
key
sequence
can
be
any
program
step
you
choose,
though
a
nis
especially
handy
at
these
points.