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80486 processor

The superscalar 32-bit microprocessor from Intel is introduced in 1989. As the successor of the 80386, it is also available in several versions: DX, SX and SL and, in addition, in two further DX variants, namely DX2 and DX4. The 486DX has a level 1 cache with 8/16 KB, the floating point unit( FPU) and the memory manager( MMU) integrated on the chip.

The data bus has a data word width of 32 bits, the address bus has the same data word width, via which a maximum of 4 GB memory space can be addressed. The DX is available with clock frequencies of 16, 20, 25, 33 and 50 MHz, the faster variants DX2 (1992) with clock rates of 40, 50 and 66 MHz and furthermore an AMD version with 80 MHz and the DX4 with 75 and 100 MHz. The AMD version of the 486DX4 (1994) has 120 and 133 MHz. The clock rates of the SX version essentially correspond to those of the 486DX. With the 486DX, the most frequently used instructions could be executed in two clocks. The computing power was 41 MIPS at a clock rate of 50 MHz.

Overview of the 80x86 processors

Overview of the 80x86 processors

The 486SX differs in that the SX has no integrated coprocessor.

In terms of integration density, the 80486, which is manufactured in CMOS technology, represents SLSI technology with a structure width of 1 µm and about 1.2 million transistors.

CPU socket 1 was developed for the 486 DX and SX, socket 2 for DX2 and SX2 and CPU socket 3 for DX4.

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Englisch: 80486 processor
Updated at: 17.09.2009
#Words: 229
Links: arsenic (As), digital experience (DX), simplex (SX), second life (SL), level
Translations: DE
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