NOTE TO ADVANCED USERS
If you want to use variables for the diskette name or id, the format
is
as
follows:
C128, Plus/4:
HEADER (A$),J(B$),DO
C64: OPEN
J5,8,15:PRINT#15,"NO:"+A$+B$:CLOSEI5
Where:
A$ contains the diskette name (16 character limit)
B$ contains the
id
(2 characters long)
After you format a particular diskette, you can reformat
it
at any time. You can
change
its
name and erase
its
files faster by omitting the
id
number
in
the HEADER
command.
DISKETTE DIRECTORY
A directory
is
a list of the files on a diskette. To load the directory
on
the C
128
or
Plus/4, type the word DIRECTORY on a blank line and press the RETURN key or simply
press the
F3
key on the C128. That doesn't erase anything
in
memory,
so
you can call up a
directory anytime--even from within a program. The C64 directory command, LOAD
"$",8
(press RETURN) LIST (press RETURN), does erase what's
in
memory.
If
a directory doesn't all
fit
on the screen,
it
will scroll
up
until
it
reaches the last line.
If you want to pause, stop, or slow down the scrolling, refer to your particular computer's
user's manual for instructions
as
to
which keys
to
use.
To get an idea
of
what a directory looks like, load the directory from the Test/Demo
diskette.
The 0 on the left-hand side
of
the top line
is
the drive number of the
1571
(on a dual
disk drive it could be 0 or
1). The diskette name
is
next, followed by the diskette
id-both
of which are determined when the diskette
is
formatted.
The
2A
at the end
of
the top line means the
1571
uses Version 2A
of
Commodore's
disk operating system (DOS).
Each of the remaining lines provides three pieces
of
information about the files on the
diskette. At the left end
of
each line is the size
of
the
file
in
blocks
of
254 characters. Four
blocks are equivalent to almost I K of memory inside the computer. The middle
of
the line
contains the name
of
the
file
enclosed
in
quotation marks. All characters within the
quotation marks are part
of
the filename. The right side
of
each line contains a three-letter
abbreviation
of
the
file
type. The types
of
files are described
in
later chapters.
11
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