Memory Setting, Cache RAM Size Select JP8, SIMM1

AR-B1474 User¡¦s Guide

3.2.8 Memory Setting

(1) Cache RAM Size Select (JP8)

The AR-B1474 can be configured to provide a write-back or write-through cache scheme and support 128KB to 512KB cache systems. A write-back cache system may provide better performance than a write-through cache system. The BIOS Setup program allows you to set the cache scheme either write-back or write-through, either the internal cache selection.

The AR-B1474 needs four 32Kx8 SRAM chips to construct 128KB cache. To construct 256KB cache, four 64Kx8 SRAM chips are needed. Four 128Kx8 SRAM chips will provide 512KB cache.

JP8JP8JP8

4	3	4	3	4
2	1	2	1	2
128KB	256KB			512KB

(Factory Preset)

Figure 3-15 JP8: Cache RAM Size Select

(3) DRAM Configuration

There is one 32-bit memory bank on the AR-B1474 card. It can be one-side or double-side SIMM (Single-Line Memory Modules) which is designed to accommodate 256Kx36 bit to 8Mx36 bit SIMMs. This provides the user with up to 32MB of main memory. The 32-bit SIMM (without parity bit) also can be used on AR-B1474 card. There are six on-board memory configurations available. Please refer to the following table for details:

SIMM1	Total Memory
256KX32(X36)	1MB
512KX32(X36)	2MB
1MX32(X36)	4MB
2MX32(X36)	8MB
4MX32(X36)	16MB
8MX32(X36)	32MB

Table 3-7 DRAM Configuration

3-9

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.

Sony DX4, 486DX, AR-B1474 Memory Setting, Cache RAM Size Select JP8, Dram Configuration, SIMM1

Models: DX4 AR-B1474 486DX