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80286 processor

The 80286, commonly referred to as the "286", was introduced by Intel in 1982 and was the standard CPU for IBM-compatible PCs from 1984. This superscalar microprocessor was manufactured in CMOS technology with a structure width of 1.5 µm and had over 140,000 transistors.

Integrated circuit of the 80286 with approx. 140,000 transistors, photo: Intel

Integrated circuit of the 80286 with approx. 140,000 transistors, photo: Intel

The 80286 had an address space of 16 megabytes ( MB) (24-bit address bus) and a maximum computing power of 2.66 MIPS. The clock rate was 6, 8, 12, 16, 20 and 25 MHz in the different variants.

Wiring diagram of the 80286

Wiring diagram of the 80286

The 80286 had two modes of operation: real mode and protected mode. Real Mode is an 8086-compatible mode with an addressable memory area of 1 MB. In Protected Mode, the addressable memory area is 16 MB, but at the expense of compatibility. Switching back from one mode to the other was not possible, which is why the Disc Operating System( DOS) remains in 1 MB mode today.

Informations:
Englisch: 80286 processor
Updated at: 25.09.2007
#Words: 140
Links: standard (STD), central processing unit (CPU), complementary metal oxide semiconductor (Chip) (CMOS), structure width, address space (AS)
Translations: DE
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