Encyclopedia > Intel 80486DX

  Article Content

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. This was split into two 4096-byte (4k) sections, which handled Data and Instructions. The 386 supported an off-chip cache, but this was much slower and did not have the Data/Instruction differentiation.

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

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article

... an adherent of a monarch or royal family. Of the more specific uses of the term, the most common include: 1. A supporter of King Charles I of England during the ...

This page was created in 31.2 ms