EasyManuals Logo

Sharp MZ-800 User Manual

Sharp MZ-800
221 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #142 background imageLoading...
Page #142 background image
OUT@
Format
OUT@
<port
number>,
<numeric
expression>
Explanation
The
OUT@
statement
converts
the
decimal
number
specified
in
<numeric
expres-
sion>
(0
to
255)
to
a
binary
format
and
sends
it
to
the
output
port
specified
in
<port
number>.
<port
number>
may
range
from
0
to
127
(hexadecimal
$00
to
$7F).
Port
addresses
128
to
255
(hexadecimal
$80
to
$FF)
are
reserved
for
optional
peripheral
devices.
Peripheral
devices
are
controlled
by
data
transmitted
to
I/O
ports.
Consequently,
specifying
an
illegal
number
in
<port
number>
may
cause
peripheral
device
mal-
function.
USR
Format
USR
(<address>[,<input
string
variable>]
[,<output
string
variable>])
Abbreviated
Format
Explanation
U.
The
USR
function
transfers
control
to
a
machine
language
program
which
starts
at
the
specified
address.
As
with
CALL
<address>,
control
is
returned
to
the
state-
ment
following
the
USR
function
when
a
return
instruction
RET
or
RET
cc
is
en-
countered
in
the
machine
language
program.
<address>
must
be
a
decimal
or
4-digit
hexadecimal
number.
The
parameters
are
loaded
into
the
following
registers
when
the
main
program
trans-
fers
control
to
the
machine
language
program:
DE
register:
Starting
address
of
<input
string
variable>
in
memory.
B
register:
length
of
<input
string
variable>.
IX
register:
address
of
the
error
processing
routine,
if
declared.
The
machine
program
loads
processing
results
into
the
following
registers
when
it
returns
control
to
the
main
program:
DE
register:
starting
address
of
<output
string
variable>
in
memory.
B
register:
length
of
<output
string
variable>.
The
following
steps
are
necessary
when
error
processing
is
required
in
the
machine
language
program:
1.
Declare
an
error
processing
routine
in
the
BASIC
program
using
an
ON
ERROR
GOTO
statement.
2.
Write
a
program
segment
which
loads
the
A
register
with
the
error
code
and
causes
program
execution
to
jump
to
the
address
specified
in
the
IX
register.

Table of Contents

Other manuals for Sharp MZ-800

Preview: Technical Reference And User's Guide
Technical Reference And User's Guide170 pages
Preview: Service Manual
Service Manual71 pages

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Sharp MZ-800 and is the answer not in the manual?

Sharp MZ-800 Specifications

General IconGeneral
BrandSharp
ModelMZ-800
CategoryDesktop
LanguageEnglish

Related product manuals