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In page Microcode:

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Among the ultimate implementations of microcode in microprocessors is the Motorola 68000. This offered a highly orthogonal instruction set with a wide variety of addressing modes, all implemented in microcode. This did not come without cost, according to early articles, about 20% of the chip's surface area (and thus cost) is the microcode system[3] and[citation needed] of the systems 68,000 transistors were part of the microcode system.