The S80486DX4-100SV8B is a high-performance 32-bit microprocessor manufactured by AMD. It is a member of the Intel 80486 family and is designed for use in desktop computers, embedded systems, and other applications requiring significant processing power. The DX4 designation indicates that it is a clock-doubled version of the 80486, meaning it operates internally at twice the speed of the external bus.

Applications

• Desktop Computers: Used in early to mid-1990s desktop PCs, providing processing power for operating systems and applications.
• Embedded Systems: Found in industrial control systems, point-of-sale terminals, and other embedded devices requiring robust processing capabilities.
• Gaming Consoles: Potentially used in some early gaming console designs, offering a balance of performance and cost.
• Industrial Automation: Employed in automated manufacturing systems for controlling machinery and processes.
• Network Devices: Utilized in network routers and switches for packet processing and routing tasks.

Features

• 32-bit Architecture: Supports 32-bit data and address buses, enabling efficient memory access and data processing.
• Clock Doubling: Operates internally at 100MHz while maintaining compatibility with a 33MHz external bus.
• Integrated Floating-Point Unit (FPU): Provides hardware acceleration for floating-point calculations, improving performance in scientific and engineering applications.
• 8KB Internal Cache: Includes an 8KB cache memory for storing frequently accessed data and instructions, reducing memory access latency.
• Memory Management Unit (MMU): Offers memory protection and virtual memory support, enhancing system stability and security.

Benefits

• Improved Performance: Clock doubling significantly increases processing speed compared to earlier 80486 processors.
• Enhanced Floating-Point Performance: Integrated FPU accelerates floating-point calculations, benefiting applications that heavily rely on numerical computations.
• Reduced Memory Access Latency: Internal cache minimizes the need to access main memory, resulting in faster program execution.
• Increased System Stability: MMU provides memory protection, preventing applications from interfering with each other and causing system crashes.
• Compatibility: Maintains compatibility with existing 80486 software and hardware, allowing for easy upgrades.

The S80486DX4-100SV8B operates at 100MHz internally and connects to a 33MHz external bus. It uses a 168-pin PGA package. The processor requires a 5V power supply. It supports a 4GB addressable memory space. The typical thermal design power (TDP) is around 11 watts. It is designed to execute x86 instructions. The processor includes features for debugging and testing. It provides support for virtual 8086 mode, enabling execution of legacy DOS applications.