Radio Shack TRS-80 model III Owner's Manual page 138

DISK
BASIC
The
"current record"
is
the
record
whose number
is
one higher than
that
of
the
last
record accessed.
The
first
time
you
access a
file
via a particular buffer, the
current record
is
set
equal
to
1
For example:
Program
statement
Effect
1000OPEN"R
,
\l,
t 'NAME/BAS'
1010
FIELD
1,...
1020
GET
1
1025
REM.
..ACCESS
BUFFER
1030
GET
1,30
1035
REM...
ACCESS BUFFER
1040
GET
1,25
1046
REM...
ACCESS BUFFER
1050
GET
1
Open
name/bas
for
random
access
using buffer
1
Structure buffer
get
record
1
into buffer
1
get
record
30
into
buffer
1
get
record 25
into
buffer
1
get
record 26
into buffer
1
If
you
are using variable-length records (not fixed-length),
an attempt
to
get
past the
end
of
file
will
produce
an
error.
If
you
are
using fixed-length records, the
same
attempt
will return a null
record
and no
error will occur.
To
prevent
this
from
occurring,
you
can use
the
lof
function
to
determine
the
number
of
the highest
numbered
record.
PUT
Write a
Record
to
Disk
—
Random
Access
pmmmp1hnmxfi2l
rt/ite^$peeiiles a
random
access
file buffer,
nmexp-
1
^.;>ilv
nmmp2^e$i&$
the record
number
in
the
ii\B,
nmexp2\$$BmMyf)\}
want
to write.
If
nmexp2
is
omitted, the current record
number
is
assumed.
This statement
moves
data
from
a
file's
buffer into a specified place
in
the
file.
Before PUTting
data
in
a
file,
you
must:
1
.
open
the
file,
thereby assigning a buffer
and
defining the access
mode
(must
be
r);
137