Intel 80486DX
Intel's successor to the Intel 80386 processor line.
The important changes were:
Data/Instruction Cache- An 8192-byte (8k) SRAM built into the processor core, designed to store the most commonly used instructions. The 386 supported an off-chip cache, but this was much slower.
Pipelining- This allows the processor to handle a LocateFetchExecute each clock cycle.
The pipeline is offset meaning the execute step required information from the previous two clock cycles. A locate would be to feed the next fetch, the fetch would be to feed the next execute. The 386 needs to do each step separately.
Virtual Memory Handler- Hardwired programming to handle swapping memory to hard drive.
Integrated FPU- Added accelerated high end math functions.
Standard Stuff:
The 486 had a 32 bit data bus. This requires either 4 matched 30 pin simms or 1 72 pin simm
The 486 has a 32 bit address bus limiting it to a 4gb of ram.
The Early 486 machines often used VL bus for video cards and hard drives The bus speed matches the motherboard frequency.
See also Intel 80486
Referenced By
486SX | 80486 | Intel 486 | Intel 80486 | Intel 80486DX2 | Intel 80486SL | Intel 80486SX | List of Intel microprocessors
|
