AR-B1380/AR-B1380A User’ s Guide
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5.3 WRITE PROTECT FUNCTION
The AR-B1380/AR-B1380A provides hardware and software write protect functions for small page 5V
FLASH disks and only software write protected functions for SRAM disks. This is to prevent your data on
5V FLASH or SRAM disks from accidental ok deletion or overwrite. If your FLASH/SRAM disk is write
protected, any write operation to the protected FLASH/SRAM disk will get a write protect error:
Write protect error writing drive A
About, Retry, Fail?
5.3.1 Hardware Write Protect
To enable the hardware protect function for small page 5V FLASH disk, please refer to the “ Switch Setting” .
5.3.2 Software Write Protect
If you need the write protect function and sometimes you have to write or update data on your
FLASH/SRAM disk, you can use the software write protect instead of hardware write protect. The software
write protect function is enabled or disabled by writing a data to an I/O port.
5.3.3 Enable the Software Write Protect
Writes data 80h to the base port+0 address
Example 1: (in assembly language)
MOV DX, 210H
; If the base I/O address is 210H
MOV AL, 80H
; Enable byte = 80h
OUT DX, AL
Example 2: (in BASICA language)
OUT &H210, &H80; REM If the base I/O address is 210h
Example 3: (in Turbo C language)
outportb(0x210,0x80);/*If the base I/O address is 210h*/
5.3.4 Disable the Software Write Protect
Writes data 0 to the base port+0 address
Example 1: (in assembly language)
MOV DX, 210H
; If the base I/O address is 210h
MOV AL, 00H
; Disable byte=00h
OUT DX, AL
Example 2: (in BASICA language)
OUT &H210, &H00; REM If the base I/O address is 210h
Example 3: (in Turbo C language)
outportb(0x210,0x00);/*If the base I/O address is 210h*/
Summary of Contents for AR-B1380
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