| 21. | Four revisions of the chip exist, each physically identical but with different microcode.
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| 22. | On the HP 3000, this decision took extra microcode cycles in every instruction.
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| 23. | The microcode level that specified four bit tags was referred to as level Gamma.
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| 24. | The 2903 used microcode to emulate 1900 hardware.
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| 25. | This microcode specification became known as level Gamma.
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| 26. | It is thus somewhere between the role of microcode and of a hardware emulator.
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| 27. | Even for real microprocessors, machine-language instructions may be implemented by microcode.
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| 28. | The E Box executed all instructions, including floating-point instructions through microcode.
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| 29. | In 1972, Shustek proposed using microcode for evaluating the performance of computer systems.
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| 30. | Microcode is software embedded in a chip.
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