Casio DT-X8 Series Software Manual page 31

RAM
The integrated RAM has a total capacity of 128 MB and is used for the below purposes.
• Driver global and buffer: the work area for driver and so on
• OS area: the area to carry out deployed OS
• Program memory: the memory to carry out program including the OS work area
•
RAM XIP RAM XIP
Execute OS files deployed on RAM Execute OS files deployed on RAM
Figure 2-4
• The DriverGlobal is allocated for the work area of drivers. The camera buffer used in the
terminal for the integrated digital camera deploys camera data temporarily on taking images.
The OS files are deployed from FlashDisk to RAM, and work in the RAM quickly.
• It takes time to deploy the OS files from the FlashDisk to the RAM on clearing OS, reloading
and booting after battery is exhausted.
• There is not object store corresponded to RAM disk. Due to that, if the files are copied into
root/Windows folder under "My device" folder, data files are stored without back-up
operation even if battery is exhausted because files are created on user disk of FlashDisk
actually.
• A full reset (all memory clear) to delete object store like before is not provided. Instead, the
functions (see Chapter 2.1.8) to clear the OS and reload are made available. Because of this
reason, it is impossible to change the ratio of program memory and object store in the control
applet.
FlashDisk
The FlashDisk has 256MB as its total capacity and it is used for the following purposes.
• Boot area: Boot Loader which loads the OS to RAM is stored here.
• OS disk: OS files are stored. Boot loader deploys OS files in the RAM during booting.
• User disk: User can use freely as disk.
Boot loader Boot loader
Initialization Initialization OS files for deployment on RAM OS files for deployment on RAM
Figure 2-5
• In the boot area, boot loader and etc. are stored to deploy OS files in the RAM.
• In the OS disk, internal application and etc. are stored.
• The FlashDisk different from RAM does not require a power to back up data in the disk, so
data is not lost even if the terminal's memory backup battery is exhausted.
• It is not necessary to back up object store like before because the FlashDisk is mounted on
root folder below "My Device".
• Pay attention when user disk is formatted (see note), because registry, patch files, program
files and data are deleted and then initialized to the same factory defaults.
Note:
Formatting is carried out by an exclusive tool on the control applet and special key operation. See
the next chapter concerning the special key operation.
OS Work OS Work
OS Disk OS Disk
31
Program Memory Program Memory
Execute Program Execute Program
User Disk User Disk
NAND Disk NAND Disk