Radio Shack CCR-81 Owner's Manual

n:
»EL
ill
DISK
SYSTEM
You
may want
to use create
to prepare
a file
which
will
contain
a known
amount
of data. This will
usually
speed
up file
write
operations.
File
reading
will
also be
faster, since
pre-allocated
files
are less
segmented
or dispersed
on
the disk
—requiring
less motion
of
the read/write
mechanism
to
locate
the
records.
Examples
CREATE
DATAFILE/BAS
(REC=300,
LRL=0)
Creates
a file
named
datafile/bas,
and allocates
space for
300
256-byte
records.
CREATE
NAMES/TXT,
IRIS
(LRL=64
»REC=50)
Creates
a file named
names/txt
protected
by the
password
iris.
The
file will
be
large
enough
to
contain
50 records,
each 64
bytes
long.
CREATE
PAYROLL/BAS
Creates
a file named
payroll/bas
but allocates
no
space
to it.
Sample
Use
Suppose
you are
going to
store
personnel
information
on no
more
than
250
employees,
and each
data record
will
look like
this:
Name
(Up to 25
letters)
Social
Security
Number
(11 characters)
Job Description
(Up to
92 characters)
Then
your records
would
need to
be 25
+ 1 i + 92
=
128
bytes
long.
You
could
create an
appropriate
file with
this
command:
CREATE
PERSONNL/TXT
( REC=250
»LRL=
128
)
Once
created,
this
pre-allocated
file
would
allow
faster
writing
than
would
a
dynamically
allocated
file, since
trsdos
would
not have
to stop
writing
periodically
to allocate
more space
(unless
you exceed
the
pre-allocated
amount).
DATE
Reset
or
Get Today's
Date
)ah
mm da
yy
mm rid
yy
is
the specification tor
(he
month
[mm),
day
\rid] and
vea?
!
W-
36

Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English