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LoginHow was microcode implemented in retro processors?
General Tech Learning Aids/Tools 3 years ago
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manpreet![Tuteehub forum best answer]()
Best Answer
3 years ago
How was microcode implemented in retro processors such as the Z80 or 8080?
Was the microcode standard (for example a manual for the processor outlining all possible micro-instructions and the standard combinations to implement documented instructions)? If so, what are some keywords to use to find these manuals online?
Or was the microcode custom written by each manufacturer of the processor (such that for example an ADD instruction might be slightly different between manufacturers)?
Could the microcode be read and changed by a user?