HP 48gII - Manual (Page 774)

Page 26-5
Storing, deleting, and restoring backup objects
To create a backup object use one of the following approaches:
• Use the File Manager („¡) to copy the object to port. Using this
approach, the backup object will have the same name as the original
object.
• Use the STO command to copy the object to a port. For example, in
algebraic mode, to back up variable A into a backup object named AA
in port 0, use the keystroke sequence:
@@@A@@@ K „ê0™~a~a`
• Use the ARCHIVE command to create a backup of the HOME directory
(see above).
To delete a backup object from a port:
• Use the File Manager („¡) to delete the object as you would a
variable in the HOME directory (see Chapter 2 in the User’s Guide).
• Use the PURGE command as follows:
In algebraic mode, use: PURGE(: Port_Number : Backup_Name)
In RPN mode, use: : Port_Number : Backup_Name PURGE
To restore a backup object:
• Use the File Manager („¡) to copy the backup object from Port
memory to the HOME directory.
• When a backup object is restored, the calculator performs an integrity
check on the restored object by calculating its CRC value. Any
discrepancy between the calculated and the stored CRC values result in
an error message indicating a corrupted data.
Using data in backup objects
Although you cannot directly modify the contents of backup objects, you can
use those contents in calculator operations. For example, you can run
programs stored as backup objects or use data from backup objects to run
programs. To run backup-object programs or use data from backup objects
you can use the File Manager (
„¡) to copy backup object contents to