Commodore Plus 4 - Page 337

The Disk Drive 325
The filename is a string expression of up to 16 characters by which the program
will be known on the disk. Each file on a disk must have a unique name. The drive
is the optional drive number (which is not needed for the 1541). The unit is
optional; it is the device number for the disk and is assumed to be 8 if not
specified.
SAVE filename,device
The filename is the same as above. The device is the device number for the disk.
Neither of these parameters may be omitted in using the SAVE command to save
a program on the disk.
To retrieve the program, the DLOAD (or LOAD) command can be used.
DLOAD filenamejidrive^unit
The filename is the name used when saving the program. The drive and unit are
the same as PS AVE and are optional. Wild cards may be used in the file name of
a LOAD command. The first file in the directory of the diskette with a matching
name is loaded.
LOAD filename,device,ab8olute/relative flag
Again, the filename is the same name used to save the program, and the device is
the disk device number. The absolute/relativeflag is optional. If it is omitted or is
0, the file is loaded as a BASIC program starting at the beginning of BASIC
RAM. If it is 1, the file is loaded at the location from which it was saved.
To compare a program in memory with one stored on disk without altering
memory, use the VERIFY command. It reports if the file is not identical to the
program in memory.
VERIFY filename,device9ab80lute/relative flag
All of the parameters are the same as for LOAD.
Using Data Files
Several types of data files can be created, but they all share the BASIC commands
required to access them. The first step in creating any data file is to open it for use.