AR-B1474 User¡¦s Guide

Parity Check

This option enables or disables parity error checking for all system RAM. This option must be Disabled if the used DRAM SIMMs are 32-bit but not 36-bit devices.

Slow Refresh

This options sets the DRAM refresh cycle time. The settings are 15us, 30us, 60us, and 120us.

Hidden Refresh

Hidden refresh separates refreshing of AT-bus memory and local DRAM. The AT-bus controller arbitrates between CPU accesses to the AT bus, DMA, and AT refresh, while the DRAM controller arbitrates between CPU DRAM accesses and DRAM refresh cycle.

Ext. Cache WB/WT Feature

This option selects the type of caching algorithm of secondary cache memory. The settings are Wr-Thru or Wr- Back.

Int. Cache WB/WT Feature

This option selects the type of caching algorithm of CPU internal cache memory. The settings are Wr-Thru or Wr- Back.

ISA Write Cycle Insert WS

When Enabled, the wait state is added in both I/O and memory write cycle.

16-Bit ISA I/O Command WS

This option sets the wait state of 16-bit I/O cycle. The settings are 0WS, 1WS, 2WS, and 3WS.

16-Bit ISA Mem. Command WS

This option sets the wait state of 16-bit memory cycle. The settings are 0WS, 1WS, 2WS, and 3WS.

Polling Clock Select

This option sets the polling clock of IRQ and DRQ signals. The settings are CLK2, CLK2/2, CLK2/3, CLK2/4, 28.6MHz, and 14.3MHz.

6.5 POWER MANAGEMENT

This section is used to configure Power management setup for configuring power management features.

IDE Standby Mode (Min.)

This option specifies the length of time of hard disk drive inactivity that must expire before the IDE hard disk drive is placed in IDE Standby Power Down Mode.

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Sony 486DX, DX4, AR-B1474 manual Power Management

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.