Sony 486DX Overview, 2 I/O Port Address Select SW1-1 & SW1-2, DEVICE=C\DOS\EMM386.EXE X=C800-CFFF

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AR-B1474 User¡¦s Guide

5.2.1 Overview

There is 1 DIP Switch located on the AR-B1474. It performs the following functions:

ON

OFF 1 2 3 4 5 6 7 8

Figure 5-2 SW1: Switch Select

SW1-1 & SW1-2 Set the base I/O port address SW1-3 & SW1-4 Set the starting memory address SW1-5 & SW1-6 Set the drive number of solid state

disk

SW1-7 & SW1-8 Set the used ROM memory chips

5.2.2 I/O Port Address Select (SW1-1 & SW1-2)

SW1-1 & SW1-2 are provided to select one of the four base port addresses for the watchdog timer and the solid state disk. The AR-B1474 occupies 6 I/O port addresses. Followings state selections of base port address.

SW1-1

SW1-2

Base Port

Solid State Disk

Watchdog

OFF (*)

OFF

210h

210h-213h

214h-215h

ON

OFF

290h

290h-293h

294h-295h

OFF

ON

310h

310h-313h

314h-315h

ON

ON

390h

390h-393h

394h-395h

Table 5-1 I/O Port Address Select

5.2.3 SSD Firmware Address Select (SW1-3 & SW1-4)

The AR-B1474‘s SSD firmware occupies 16KB of memory. SW1-3 & SW1-4 are used to select the memory base address. You must select an appropriate address so that the AR-B1474 will not conflict with memory installed on other add-on memory cards. Additionally, be sure not to use shadow RAM area or EMM driver’ s page frame in this area.

SW1-3

SW1-4

SSD BIOS Address

Bank Memory Address

OFF (*)

OFF

C800:0 (8KB)

CA00:0 (8KB)

ON

OFF

CC00:0 (8KB)

CE00:0 (8KB)

OFF

ON

D000:0 (8KB)

D200:0 (8KB)

ON

ON

DC00:0 (8KB)

DE00:0 (8KB)

Table 5-2 SSD Firmware Address Select

If you are not going to use the solid state disk (SSD), you could use JP7 to disable the SSD BIOS. The AR-B1474 will not occupy any memory address if the SSD BIOS is disabled.

If you are going to install the EMM386.EXE driver, please use the [X] option to prevent EMM386.EXE from using the particular range of segment address as an EMS page which is used by AR-B1474. For example, write a statement in the CONFIG.SYS file as follow: (If the memory configuration of AR-B1474 is C800:0)

DEVICE=C:\DOS\EMM386.EXE X=C800-CFFF

5-2

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Contents Industrial Grade 486DX/DX2/DX4 CPU Card Page Table of Contents Bios Console Specifications Placement & DimensionsMemory Banks & Programming RS-485 SSD Types Supported & IndexPreface Static Electricity Precautions OrganizationOverview IntroductionFeatures Packing ListSystem Controller DMA ControllerKeyboard Controller DMA ControllerInterrupt Controller Interrupt ControllerHex Range Device 1 I/O Port Address MapI/O Port Address Map Timer Real-Time Clock and Non-Volatile RAMAddress Description Real-Time Clock & Non-Volatile RAMISA Bus Pin Assignment ISA Bus Pin AssignmentISA Bus Signal Description Name DescriptionSerial Port Receiver Buffer Register RBRTransmitter Holding Register THR DlabInterrupt Enable Register IER Interrupt Identification Register IIRLine Control Register LCR Modem Control Register MCRParallel Port Modem Status Register MSRDivisor Latch LS, MS Register AddressPrinter Status Buffer Data SwapperPrinter Control Latch & Printer Control Swapper Setting UP the System OverviewSystem Setting RS-232 Connector DB1 & DB2Serial Port RS-485 Adapter Select JP3 & JP11Power Connector J5 Hard Disk IDE Connector CN1HDD Pin Assignment Parallel Port Connector CN3 FDD Port Connector CN2CN3 Pin PC/104 Connector Bus a & B CN6 6 PC/104 ConnectorPin PC/104 Connector Bus C & D CN4 PC/104 ISA Bus Signal Description IRQ 3-7, 9-12, 14CPU Setting AMD DX2-80 CPU Select JP1CPU Voltage Select JP2 AMD 4X CPU 5x86 Select JP15CPU Clock Setting CPU Clock Select JP6 & JP9Memory Setting Dram ConfigurationCache RAM Size Select JP8 SIMM1Keyboard Connector LED Header J1, J2 & J4Reset Header J7 Battery SettingExternal Speaker Header J3 CRT Display Type Select JP13Page Installation Utility Diskette PGM1474.EXEWP1474.EXE WD1474.EXEBU1474.EXE Display Error in PGF File Help to PGF FileEnable the Software Write Protect Disable the Software Write ProtectWrite Protect Function Hardware Write ProtectWatchdog Timer Watchdog Timer SettingTime-Out Setting Time Factor Time-Out Period SecondsWatchdog Timer Trigger Watchdog Timer EnabledWatchdog Timer Disabled Page Switch Setting Solid State DiskOverview 2 I/O Port Address Select SW1-1 & SW1-2SSD Firmware Address Select SW1-3 & SW1-4 DEVICE=C\DOS\EMM386.EXE X=C800-CFFFSimulate 2 Disk Drive SSD Drive Number SW1-5 & SW1-6Flash Eprom Sram ROM Type Select SW1-7 & SW1-8 Disk Drive Name ArrangementJumper Setting SSD Bios Select JP7SSD Memory Type Setting M1 ~ M3 & JP5 ROM Disk InstallationSwitch and Jumper Setting UV Eprom 27CxxxUV Eprom 27CXXX Switch Setting Software Programming5V Large Flash 29FXXX Switch Setting Large Page 5V Flash Disk5V Flash 29CXXX & 28EEXXX Switch Setting Small Page 5V Flash ROM DiskUsing Tool Program Typing DOS CommandJumper Setting RAM DiskInstallation D.O.C Hardware SettingSSD Bios Setting JP7 Combination of ROM and RAM DiskSoftware Setting O.C. Setting SW1-8Page Bios Console Bios Setup OverviewStandard Cmos Setup Date & Time SetupFloppy Setup Hard Disk SetupAdvanced Cmos Setup IDE Block Mode Transfer IDE LBA ModeInternal Cache Memory ShadowAdvanced Chipset Setup Power Management Setting Password Password CheckingAuto Configuration with Optimal Setting Auto Configuration with Fail Safe SettingSave Settings and Exit Bios ExitExit Without Saving Specifications BiosCPU PCBPage Placement & Dimensions PlacementDimensions Using Memory Bank Memory Banks & Programming RS-485CS1 CS0 SocketInitialize COM port Programming RS-485Send out one character Transmit Receive data Send out one character to COM1Page SSD Types Supported & Index SSD Types Supported10-2 Index Name Function

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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