Sony AR-B1474, DX4, 486DX Write Protect Function, Hardware Write Protect, Software Write Protect

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AR-B1474 User¡¦s Guide

4.3 WRITE PROTECT FUNCTION

The AR-B1474 provides hardware and software write protect functions for small page 5V FLASH disk and only software write protected function for SRAM disk. This is to prevent your data on 5V FLASH or SRAM disk from accidental 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?

4.3.1 Hardware Write Protect

To enable the hardware protect function for small page 5V FLASH disk, please set the SW1-5 to “ON” and the SW1-6 to “OFF”, please refer to the “Switch Setting” .

4.3.2 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.

4.3.3 Enable the Software Write Protect

Writes data 08h to the base port+2 address

Example 1: (in assembly language)

MOV DX, 212H ; If the AR-B1474’ s base I/O address is 210H

MOV AL, 08H ; Enable byte = 08h

OUT DX, AL

Example 2: (in BASICA language)

OUT &H212, &H08; REM If the AR-B1474’ s base I/O address is 210h

Example 3: (in Turbo C language)

outportb(0x212,0x08);/*If the AR-B1474’ s base I/O address is 210h*/

4.3.4 Disable the Software Write Protect

Writes data 0 to the base port+2 address

Example 1: (in assembly language)

MOV DX, 212H

; If the AR-B1474’ s base I/O address is 210h

MOV AL, 00H

; Disable byte=00h

OUT DX, AL

 

Example 2: (in BASICA language)

OUT &H212, &H00 ; REM If the AR-B1474’ s base I/O address is 210h

Example 3: (in Turbo C language)

outportb(0x212,0x00); /*If the AR-B1474’ s base I/O address is 210h*/

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Contents Industrial Grade 486DX/DX2/DX4 CPU Card Page Table of Contents SSD Types Supported & Index Bios ConsoleSpecifications Placement & Dimensions Memory Banks & Programming RS-485Preface Organization Static Electricity PrecautionsIntroduction OverviewPacking List FeaturesDMA Controller System ControllerDMA Controller Keyboard ControllerInterrupt Controller Interrupt ControllerI/O Port Address Map 1 I/O Port Address MapHex Range Device Real-Time Clock & Non-Volatile RAM TimerReal-Time Clock and Non-Volatile RAM Address DescriptionISA Bus Pin Assignment ISA Bus Pin AssignmentName Description ISA Bus Signal DescriptionDlab Serial PortReceiver Buffer Register RBR Transmitter Holding Register THRModem Control Register MCR Interrupt Enable Register IERInterrupt Identification Register IIR Line Control Register LCRRegister Address Parallel PortModem Status Register MSR Divisor Latch LS, MSPrinter Control Latch & Printer Control Swapper Data SwapperPrinter Status Buffer Overview Setting UP the SystemRS-485 Adapter Select JP3 & JP11 System SettingRS-232 Connector DB1 & DB2 Serial PortHDD Pin Assignment Hard Disk IDE Connector CN1Power Connector J5 CN3 FDD Port Connector CN2Parallel Port Connector CN3 Pin PC/104 Connector Bus C & D CN4 6 PC/104 ConnectorPin PC/104 Connector Bus a & B CN6 IRQ 3-7, 9-12, 14 PC/104 ISA Bus Signal DescriptionAMD 4X CPU 5x86 Select JP15 CPU SettingAMD DX2-80 CPU Select JP1 CPU Voltage Select JP2CPU Clock Select JP6 & JP9 CPU Clock SettingSIMM1 Memory SettingDram Configuration Cache RAM Size Select JP8LED Header J1, J2 & J4 Keyboard ConnectorCRT Display Type Select JP13 Reset Header J7Battery Setting External Speaker Header J3Page Installation PGM1474.EXE Utility DisketteBU1474.EXE WD1474.EXEWP1474.EXE Help to PGF File Display Error in PGF FileHardware Write Protect Enable the Software Write ProtectDisable the Software Write Protect Write Protect FunctionTime Factor Time-Out Period Seconds Watchdog TimerWatchdog Timer Setting Time-Out SettingWatchdog Timer Disabled Watchdog Timer EnabledWatchdog Timer Trigger Page Solid State Disk Switch SettingDEVICE=C\DOS\EMM386.EXE X=C800-CFFF Overview2 I/O Port Address Select SW1-1 & SW1-2 SSD Firmware Address Select SW1-3 & SW1-4Flash Eprom Sram SSD Drive Number SW1-5 & SW1-6Simulate 2 Disk Drive Disk Drive Name Arrangement ROM Type Select SW1-7 & SW1-8SSD Bios Select JP7 Jumper SettingUV Eprom 27Cxxx SSD Memory Type Setting M1 ~ M3 & JP5ROM Disk Installation Switch and Jumper SettingSoftware Programming UV Eprom 27CXXX Switch SettingLarge Page 5V Flash Disk 5V Large Flash 29FXXX Switch SettingSmall Page 5V Flash ROM Disk 5V Flash 29CXXX & 28EEXXX Switch SettingTyping DOS Command Using Tool ProgramRAM Disk Jumper SettingCombination of ROM and RAM Disk Installation D.O.CHardware Setting SSD Bios Setting JP7O.C. Setting SW1-8 Software SettingPage Bios Setup Overview Bios ConsoleHard Disk Setup Standard Cmos SetupDate & Time Setup Floppy SetupAdvanced Cmos Setup Shadow IDE Block Mode TransferIDE LBA Mode Internal Cache MemoryAdvanced Chipset Setup Power Management Auto Configuration with Fail Safe Setting Setting PasswordPassword Checking Auto Configuration with Optimal SettingExit Without Saving Bios ExitSave Settings and Exit PCB SpecificationsBios CPUPage Placement Placement & DimensionsDimensions Socket Using Memory BankMemory Banks & Programming RS-485 CS1 CS0Send out one character Transmit Programming RS-485Initialize COM port Send out one character to COM1 Receive dataPage SSD Types Supported SSD Types Supported & Index10-2 Name Function Index

DX4, AR-B1474, 486DX specifications

The Sony 486DX, AR-B1474, and DX4 are notable examples of advanced computing technologies from the early to mid-1990s, a time when personal computers were rapidly evolving to meet increasing user demands. These systems played a pivotal role in shaping the landscape of modern computing.

The Sony 486DX is built around the popular Intel 80486 microprocessor, which was a significant step up from its predecessor, the 386. The 486DX featured a 32-bit architecture and introduced integrated cache memory, which greatly enhanced data processing speeds and overall system performance. Operating at clock speeds typically ranging from 25 to 100 MHz, the 486DX models provided a solid foundation for running more sophisticated software applications and advanced games of the era.

Accompanying the 486DX was the AR-B1474 motherboard, designed to maximize the potential of the 486 architecture. This motherboard featured support for up to 512 KB of level 2 cache memory, further boosting performance for data-heavy tasks. The AR-B1474 also included extensive connectivity options, with ISA slots for legacy devices, as well as support for EISA, making it compatible with a wide range of hardware peripherals. This versatility made the AR-B1474 a popular choice among builders of custom desktop PCs during its time.

The DX4, another significant milestone, built upon the 486 architecture by introducing a clock-doubling technique. By effectively allowing the processor to perform operations at up to three times its base clock speed (typically 75 or 100 MHz), the DX4 could handle even more demanding applications, thereby providing users with significant performance improvements without requiring a complete overhaul of their systems.

Both the 486DX and DX4 processors facilitated advancements in multimedia capabilities, with improved graphics rendering and audio performance that supported CD-ROMs and early gaming technologies. This made them particularly appealing to consumers looking for a versatile machine for both work and entertainment.

Overall, the combination of the Sony 486DX, AR-B1474 motherboard, and DX4 processor exemplifies a significant chapter in computing history, showcasing how hardware advancements seamlessly integrated with user needs for performance and flexibility. As these technologies laid the groundwork for future innovations, they remain noteworthy for their contributions to the evolution of personal computing.
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