AR-B1474 User¡¦s Guide

Internal Cache Memory

This option specifies the caching algorithm used for L1 internal cache memory. The settings are:

Setting

Description

Disabled

Neither L1 internal cache memory on the CPU or L2

 

secondary cache memory is enabled.

WriteBack

Use the write-back caching algorithm.

WriteThru

Use the write-through caching algorithm.

Table 6-1 Internal Cache Setting

External Cache Memory

This option specifies the caching algorithm used for L2 secondary (external) cache memory. The settings are:

Setting

Description

Disabled

Neither L1 internal cache memory on the CPU or L2

 

secondary cache memory is enabled.

WriteBack

Use the write-back caching algorithm.

WriteThru

Use the write-through caching algorithm.

Table 6-2 External Cache Setting

BootSector Virus Protection

When enabled, BIOS warns the user when any program attempts to write to or format the boot sector and allows the user to intervene.

Shadow

These options control the location of the contents of the 32KB of ROM beginning at the specified memory location. If no adapter ROM is using the named ROM area, this area is made available to the local bus. The settings are:

SETTING

DESCRIPTION

Disabled

The video ROM is not copied to RAM. The contents of

 

the video ROM cannot be read from or written to cache

 

memory.

Enabled

The contents of C000h - C7FFFh are written to the same

 

address in system memory (RAM) for faster execution.

Cached

The contents of the named ROM area are written to the

 

same address in system memory (RAM) for faster

 

execution, if an adapter ROM will be using the named

 

ROM area. Also, the contents of the RAM area can be

 

read from and written to cache memory.

Table 6-3 Shadow Setting

Video ROM Shadow C000, 32K

When this option is set to Enabled, the video ROM area from C000h-C7FFh is copied (shadowed) to RAM for faster execution.

IDE Block Mode Transfer

If your hard disk supports multi-sector transfer, you can enable this option to speed the IDE transfer rate. When Enabled, the Read/Write and From/To operations between BIOS and hard disk will be done block by block.

IDE LBA Mode

The maximum capacity of a standard IDE disk drive without LBA mode was 528MB. The LBA mode enables IDE drive to have more than 528MB in one disk drive.

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Sony AR-B1474, DX4, 486DX manual Internal Cache Memory, Video ROM Shadow C000, 32K, IDE Block Mode Transfer, IDE LBA Mode

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.