Commodore Plus 4 - Page 347

The Disk Drive 335
Renaming Files on a Diskette
Occasionally it is necessary to change the name of an existing (and properly
closed) file on a diskette. The BASIC RENAME command is
RENAMEDdrive, "old name"TO"new name" JJunit
where drive is the optional drive number (which is not needed on the 1541), old
name is the original name of the file, new name is the final name of the file, and
unit is the optional device number of the disk drive.
To rename a file by direct command to the DOS, use
PRUjT* filenumber,"B,:newname'old name"
where filenumber is the logical file number of the previously opened command
channel, and new name and old name are the final and original file names.
Copying Files on a Diskette
To create an exact duplicate of a file on the diskette, the COPY command is used.
The new copy must be on the same diskette and have a different name from the
original. Relative files cannot be copied with this command.
GOFYDdrive/'orig name"TODdrive,"copyname" 9OTX Uuixzfc
where drive is the optional drive number (which is not needed on the 1541), orig
name is the name of the original file, copy name is the name of the copy, and unit
is the optional device number of the disk drive.
To copy a file by direct command to |he DOS, use
PRIET* filenumber," C: copy name=orig name"
where filenumber is the logical file number of the previously opened command
channel, and copy name and orig name are the names of the copy and the original
file.
Direct-Access Programming The DOS accepts nine commands in addition to
those already described. These commands allow the programmer to read and
write specific sectors on the diskette and to access the memory in the disk drive.
Remember that sectors you write directly onto the diskette do not normally
appear in the directory and are deallocated if the disk is validated (COLLECTed).