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[Home]Intel 80486

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The Intel 80486 (i486, 486) is a range of Intel CISC? microprocessors which is part of the Intel x86 family of processors.

The 486s are very similar to their immediate predecessor, the Intel 80386. The main differences are that the 486 has an optimised instruction set, has an on-chip unified instruction and data cache, an optional on-chip [floating-point unit]? (FPU), and an enhanced bus interface unit. These improvements yield a rough doubling in performance over an Intel 80386 at the same clock rate.

There are several suffixes and variants including:

[Intel 80487]? - 486DX with a slightly different pinout for use in 486SX systems as a FPU.

External clock rates include 16MHz, 20MHz, 25MHz, 33MHz, 40MHz and 50MHz.

The 486 processor has been licensed or reverse engineered by other companies such as IBM, AMD, Cyrix?, and [[Chips & Technologies]]. Some are almost exact duplicates in specications and performance, some aren't.

The successor to the 486 is the Pentium.

Based on material from FOLDOC, used with permission.

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Last edited December 17, 2001 12:31 am by Uriyan (diff)