Radio Shack TRS-80 model III Owner's Manual page 125

TRS-80
MODEL
III
DISK
SYSTEM
o Sequential output
starting
at
the
first
record.
If
the
file is
not
found,
It
will
be
created.
e (Extend) Sequential output
starting at
end
of
file.
If
the
file is
not
found.
It
will
be
created.
r
Random
input/output,
if
the
file is
not found,
it
will
be
cmatedf
If
mode
is
a constant,
it
must be
enclosed
in
quotes.
buffer
is
a numeric
expression
specifying which
buffer
is
to
be used;
fffeis a
string
expression containing
the
file specification.
If
a constant
is
used,
it
must be
enclosed
in
quotes.
record-length
is
a numeric expression from
to
256
specifying the
logical
record length.
is
the
same
as 256. This option
may
only be used
if
¥ariable-length records were
requested
during
initialization
(How
Many
Files?).
If
record-length
is omitted,
256
is
used, record-length
is
used
with
Random
access
only.
This statement
lets
you
create a
file,
write data
into
it,
update
it,
and
read
it.
For
details
on
file
access, see
Methods
of Access
later in this
section.
If file
includes a drive
specification,
basic
will use only
the specified drive.
If
no
drive
is
specified,
basic
will search
for a
matching
file,
starting
with
the
master
drive (usually Drive
0).
Examples
OPEN
"0"
*
1
t
"DATAFILE"
Opens
datafile
(creates
it
if
it
doesn't already
exist) for sequential output.
Output
will
be done through
buffer #1. Records
will
be 256
bytes long. Since
the
"o" mode
is
specified,
output
will
start at the
first
record
in the
file.
If
"e"
is
used
instead of
"o",
output
will
start at
the
end
of
the
file.
OPEN
"R",
2*
H
PAYROLL/A :1"
,
G4
Opens/creates
payroll/a
for
random
input/output.
Access
will
be through
buffer #2. Records
will
be 64
bytes long
(if
basic was
initialized for variable-
length records).
BUFFER
= 3:
FILE$
=
"DATA": RECLN
= 128
OPEN
"R",
BUFFER* FILE** RECLN
Opens/creates
data
for
random
input/output.
Access
will be through
buffer
#3.
Records
will
be 128
bytes long
(if
basic was
initialized
for variable-length
records).
124