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i486 ==>
Intel 486
<processor> (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.
(1995-02-21)
Try this search on OneLook / Google
Nearby terms:
integrity constraint « Intel 4004 « Intel 4040 « Intel 486 » Intel 486DX » Intel 486SX » Intel 487SX
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
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