Commodore Plus 4 - Page 108

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The BASIC Language
VERIFY
VERIFY file name, device, relocate
Abbr. vE
Compares the current program to a program on tape or disk. The verification
procedure assures you that the program you saved was stored accurately. Use
VERIFY right after you save a program to confirm accurate storage. This is very
important for saving to tape, but is not as important for disks since they are more
reliable.
You can also use VERIFY as a shortcut in positioning a tape to after a given
file. Just start at the beginning of the tape and VERIFY using the name of the file
you want to follow. The computer finds the designated file, tells you the programs
do not match, and stops just after it, ready for your next operation.
Parameters: "file name", device number, relocate flag
1. The file name is optional for tape files, required for disk files. If omitted, the
computer verifies the next program on tape.
2. The device number is 1 for cassette tape recorder or the device number for
the disk drive (8-11). The default is 1, so you can omit this parameter if you are
using a cassette recorder. The device number for the disk drive is required.
3. The relocate flag can be 0 (verify the program at the beginning of the BASIC
program area) or 1 (verify the program at the memory location where the
program was saved). This parameter is usually used only with machine-language
programs. Its value can be overridden if tape files are SAVEd in a certain way.
See SAVE.
Examples: VERIFY
VERIFY "BOXES" ,8
VOL
VOL level
Compares the current program to the next pro
gram on tape.
Compares the current program to the program
BOXES stored on disk.
Abbr. vO
Sets the volume for sounds made by the SOUND command. A VOL command
must be issued before any SOUND command can be audible. The volume you set
affects all voices.
You do not have to set the volume for each SOUND command. The last
volume setting is in effect until you issue another VOL command.
Parameter: volume level
The volume level setting can be from 0 to 8. The highest possible volume is 8.
You can turn off the volume with a level setting of 0.