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・ intel 486dx
・ intel 486sx
・ intel 487sx
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・ intel 80386
・ intel 80386dx


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Intel 486 : FOLDOC
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 circuitr


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