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Sharp MZ-800 - 6.7 Machine Language Control Statements

Sharp MZ-800
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6.7
Machine
Language
Control
Statements
PEEK
Format
PEEK
<address>
Explanation
This
function
returns
the
contents
of
the
specified
address
as
a
decimal
number
from
0
to
255.
<address>
may
be
a
decimal
number
from
0
to
65535
or
a
4-digit
hex-
adecimal
number
from
$0000
to
$FFFF.
Example
The
following
program
displays
data
stored
in
the
area
from
40960
($A000)
to
40975
($AO0F):
10
FOR
AD=40960
TO
40975
20
PRINT
PEEK
(AD)
30
NEXT
AD
40
END
POKE
Format
Explanat
ion
POKE
<address>,
<data>[,
<data>]
...
The
POKE
statement
writes
a
consecutive
number
of
data
values
starting
at
the
speci-
fied
address.
<address>
may
be
a
decimal
number
from
0
to
65535
or
a
4-digit
hexadecimal
number
from
$0000
to
SFFFF,
<datan>
may
range
from
0
to
255
or
from
$00
to
$FF.
This
statement
can
write
data
to
any
memory
location,
regardless
of
the
limit
set
by
the
LIMIT
statement.
Therefore,
careless
use
of
this
statement
can
des-
troy
the
monitor
or
BASIC
interpreter.
POKE
$D000,$5F
.
POKE
53248,95
...
The
two
statements
above
perform
the
same
function.
..
Uses
hexadecimal
numbers.
..
Uses
decimal
numbers.
INP@
Format
Explanat
ion
INP@
<port
number>,
<variable>
The
INP@
statement
reads
8-bit
data
from
the
input
port
specified
in
<
port
num-
ber
>,
converts
it
into
a
decimal
number
and
assigns
it
to
<variable>.
<port
num-
ber>
may
be
in
the
range
0
to
127
(hexadecimal
$00
to
$7F).
Port
addresses
128
to
255
($80
to
$FF)
are
reserved
for
optional
peripheral
devices.
=a
fr
tes

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