Commodore Plus 4 - Page 45

BASIC Version 3.5 Commands, Functions, and System Variables 33
• Names of all files on the disk
• The length of each file in blocks
• How^jnuch storage space remains on the disk
Press CONTROL and S to suspend the display, and any key to resume display.
Hold down 88 to slow the display.
Each 1541 disk can contain up to 664 blocks of information. You should check
to see how many blocks remain free before you COPY files onto a disk. You
should also check before you save a file if you think the disk is nearly full.
Parameters: D drive number, U unit number, "file names or prefixes"
1. Drive numbers are either 0 or 1. No other numbers are allowed. The drive
number must be preceded by D (e.g., DO). You do not need this parameter if you
are using a single drive such as the 1541, or if you are accessing drive 0 of a dual
drive.
2. U unit number is an optional parameter. Use it only if you have more than
one disk drive connected to your computer and you are accessing a device other
than unit 8. You must precede the unit number with U. You can also type ON
before U and the unit number, but ON is not required.
3. You can display a partial disk directory by specifying a file name. It is
especially useful to use wild cards in the file name. For example, after you type
DIRECTORY, add, in quotes, the beginning letters of the file names you want to
list and then the * sign. The * sign stands for all the other letters in the file names
you want to list. The command looks like this: DIRECTORY "beginning
letters*".
You can use the question mark as a wild card to stand for any single character
in a file name.
Note: The drive and unit number parameters and the file name can be speci
fied with a variable or expression in parentheses.
Examples: DIRECTORY Displays the complete list of files on the disk
currently in the disk drive.
DIRECTORY Dl Displays the directory for the disk in drive 1
of a dual drive.
DIRECTORY TJ9, "LET*" Displays a list of files whose names begin
with the characters LET. Other files on the
disk in unit 9 are not listed.
DIRECTORY "TEST?" Displays the files whose names are TEST and
one additional character (e.g., TEST1,
TESTX).