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Intel 486

   Also found in: Wikipedia 0.07 sec.
(processor)Intel 486 - (Or "i486", "iAPX 80486", and "Intel DX4" but usually just "486"). A range of Intel CISC microprocessors which is part of the Intel 80x86 family of processors.

The 486s are very similar to their immediate predecessor, the Intel 80386DX. 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 486SX - a 486DX with its FPU disabled (see crippleware).

Intel 486DX - 486SX with a working FPU.

486DX-2 - runs at twice the external clock rate.

486SX-2 - runs at twice the external clock rate.

486SL - 486DX with power conservation circuitry.

486SL-NM - 486SX with power conservation circuitry; SL enhanced suffix, denotes a 486 with special power conservation circuitry similar to that in the 486SL processors.

487 - 486DX with a slightly different pinout for use in 486SX systems.

OverDrive - 486DX-2 with a slightly different pinout for use in 486SX systems.

RapidCAD - 486DX in a special package with a companion FPU dummy package for use in Intel 80386 systems.

Intel DX4, Cyrix Cy486SLC.

External clock rates include 16MHz, 20MHz, 25MHz, 33MHz, 40MHz, although 16Mhz is rare now, and the 20MHz processors are often clock doubled.

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.


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Two years ago, the chips that powered PCs costing $1,000 to $2,000 were from the last generations of the Intel 486 family and, in Apple Macintosh, the Motorola 68000-series.
The change would come from replacing its Intel 386 microprocessor with the Intel 486, and doubling storage capacity of each of its disk-drives to 2.
Triversity will demonstrate Transactionware Enterprise running on an IBM 4694-144 hardware system with only an Intel 486 processor and 8MB of memory at Triversity booth #1921 at the National Retail Federation Show, Jan.
 
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