LOAD
DATA
Key
After you've
selected
an
address with the
LOAD
ADDRESS
key,
the
LOAD DATA
key
can
be
used
to
change the
information
contained
within
that address. Pressing
LOAD
DATA
causes
a
dash
to
appear
on
the
display
between the
address and
data. Then, any two hexadecimal
numbers
you
enter
will
be
stored
at
that
location.
Again using
the 8085
Personality Card
as
an
example,
if
you
press
LOAD ADDRESS,
the
display
will
read
“CAP
XXXX"
(the
Xs
won't
appear
on
the
display, but indicate
the
current address
pointer value). Then
the
next four
hexadecimal digits
you
enter
will
replace the address
shown.
After
the
last
address
digit
is
entered, the two
right-
hand
LEDs
will
display
the data
at
that address
Now,
if
you
press
LOAD
DATA,
the
dash
will
appear
between
the
address and the
data. The next
two
hexadecimal
values
you
enter will
be
shown
on
thedisplay
and
simultaneously
placed
into
the
address
you
specified.
As
soon
as
the
last
data
value
is
entered, the dash
will
disappear.
If
you
should
decide
that the data value
you
entered
is
wrong, simply
press
LOAD DATA
again
and
enter
the
correct
value.
As with
LOAD ADDRESS,
leading
zeros
must
be
entered
LOAD
DATA
is
a
single
action
key.
Each
time
you
want
to
change
data,
you'll have
to
press the
LOAD
DATA
key.
The
display
will
show an
error
code
if
you
try
to load
data
into
the
following locations:
@
an
area where
no memory exists
@
an
address
that
contains the operating system, whether
it
be
in
RAM
or PROM
INC Key
The
INC
key increments
the
displayed
address
by
1.
INC is
used to
examine sucessive
address
contents.
If
the
INC
key
is
held
down,
the
function
will
be
repeated
until
the
key
is
released.
Once
a
starting address has
been
entered with the
LOAD
ADDRESS
key,
the
INC
key
can
be used to
increment the
address
to
the
next location
you
might
want
to
change
with
the
LOAD
DATA
key.
Simply
increment
to
the
address
you
want, press
LOAD
DATA,
and
enter
the
new
data
value.
Operator
Familiarization—MicroLab
|
Instruction
DEC
Key
The
DEC
key
is
used
in
exactly
the same
way
as
the
INC
key,
except
that the address
is
decremented
by
1
AUTO Key
The
AUTO
key
simplifies
and
speeds
program entry
into
the
MicroLab
I.
AUTO
stands
for
“auto increment and
load
data”.
Once
a
beginning
address
has
been
established,
the
AUTO
function
will
automatically increment
the address
each
time
you
enter
a
data
value.
For
example,
if
you
press
LOAD ADDRESS,
and
then enter
3100,
the
data
at
3100
will be
shown
on
the
right
side
of
the
display.
When
AUTO
is
pressed,
the
display
will
place
a
dash between
the
address
and data. The next two
hexadecimal
values
entered
will
be displayed
as
data and
simultaneously entered
into
the address
shown.
After
you've entered the
value,
the
AUTO
function forces
the
MicroLab
|
to
the
next
address
and again
enters the
LOAD
DATA mode.
In
this
way,
you
can
enter
a
string
of
data
into
successive address
locations with no extra keypresses.
To escape
from
the
AUTO mode,
press
the
SHIFT key.
The
display
will
show
"rEAdY”.
GO
Key
The
GO key
causes the
MicroLab! to begin program
execution
at
whatever address the
CAP
is
pointing
to. For
example,
if
your program
begins
at
location
3100, use the
LOAD
ADDRESS
key
to
enter 3100
on
the
display.
Then
press
GO.
The
MicroLab
|
will
begin
execution
at
location
3100.
SPECIAL
Key
The
SPECIAL
key
causes
the
current
program execution
to
be
interrupted.
The
address
of
the
instruction interrupted
is
displayed, along
with
the
value at
that
location.
In
some
personality
cards
the
microprocessor
register
values
are
saved
in
memory
when
the
SPECIAL
key
is
pressed.
2-3
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