Casio IT-800 Series, Руководство пользователя программного обеспечения

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2.1.7 Memory Management
The high speed and large capacity RAM (MobileDDR 128MB) and FlashROM (OneNAND Flash
256MB) are integrated in the terminal.
Although RAM has been used for RAM XIP (for OS), program memory (for program files to run)
and object store (for storage of work data) in the previous Casio handheld terminals introduced in
the past, non-volatile memory (FlashROM) is integrated to the Root folder in the terminal.
Your observation is required for the new method adopted in the terminal to manipulate the
memory different from the previous Casio handheld terminals.
Notes:
•
Patch file, program file and data are not lost even if the battery pack runs down. It is no longer
needed to back up object store in the RAM.
•
Although performing a full reset initializes object store (RAM) in the previous Casio handheld
terminals, the new method initializes the RootDisk in the terminal.
•
Formatting the UserDisk initializes registry, program file, and data to their factory defaults.
•
UserDisk is divided into two blocks, RootDisk and FlashDisk. In the RootDisk, system file,
registry, and patch driver, etc. are stored while backup data of backup tool and recovery tool
are stored in the FlashDisk. This makes recovery of data from the FlashDisk possible in case
of malfunction on the system.
RAM
The integrated RAM with a total capacity of 128 MB is used for the below purposes.
DriverGlobal and buffer : Work area for driver, etc.
OS area : Area to deploy the OS to run.
Program memory : Program execution area including work area for the OS.
•
The DriverGlobal is a fixed area allocated for work area of drivers. The camera buffer used
in the digital camera integrated models deploys captured image data temporarily.
•
The OS files are deployed from the Kernel of the FlashDisk to the RAM in the terminal. This
allows the OS to run quickly on the RAM. However, it takes time to deploy the OS files from
the FlashDisk to the RAM in case when booting takes place after a full reset is performed or
the lithium-ion battery runs down.
•
Object store equivalent of the RAM disk in the previous Casio handheld terminals is no longer
integrated. If files are copied to Root and Windows folder under “My device” folder, this
creates the same files in the UserDisk of FlshROM and secures data without performing
backup in case the lithium-ion battery is not installed.
•
Although performing a full reset (all memory clear) deletes object store (RAM) in the previous
Casio terminals, it deletes the RootDisk causing registry and system DB to be deleted and to
initialize the system.
•
This does not allow to change the ratio between program memory and object store at the
Control Panel.