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Chapter 1
Using 8400 Mobile Computer
1.8 SD CARD
SD card can be accessed directly by using the provided functions in user application. Yet,
when 8400 is equipped with SD card and connected to your computer via the USB cable,
it can be treated as a removable disk (USB mass storage device) as long as it is
configured properly through programming or via System Menu | 8. Next Page | 1. SD
Card Menu | 1. Run As USB Disk. Refer to
3.8 SD Card Menu.
Note: (1) DAT files created on SD card by previous BASIC runtime are not compatible in
file format with new BASIC runtime, starting from version 1.10.
(2) While running BASIC application, the size of DAT files on SD card can be
calibrated. Go to System Menu | 8. Next Page | 1. SD Card Menu | 2. Access
SD Card | 4. Check File Size to refresh the size of “A:\BASICRUN\TXACTn.DAT”
(n=1~6).
1.8.1 FILE SYSTEM
For 8400 Series, it supports FAT12/FAT16/FAT32 and allows formatting the card through
C programming or via System Menu | 8. Next Page | 1. SD Card Menu | 2. Access
SD Card. Based on the capacity of the card, it will automatically decide the FAT format:
Card Capacity
FAT Format Sectors per Cluster
≦ 32 MB
FAT12 32
≦ 1 GB
FAT16 32
≦ 2 GB
FAT16 64
≦ 8 GB
FAT32 8
1.8.2 DIRECTORY
Unlike the file system on SRAM, the file system on SD card supports hierarchical tree
directory structure and allows creating sub-directories. Several directories are reserved
for particular use.
Reserved Directory
Related Application or Function Remark
\Program
System Menu | Load Program
Program Manager | Download
Program Manager | Activate
Kernel Menu | Load Program
Kernel Menu | Kernel Update
UPDATE_BASIC()
Store programs to this folder so that you can
download them to 8400:
C program — *.SHX
BASIC program — *.INI and *.SYN
\BasicRun BASIC Runtime Store DAT and DBF files that are created and
accessed in BASIC runtime to this folder.
Their permanent filenames are as follows:
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