That is the "x86 on RISC-ish core" interpretation of term microcode, which is probably not exactly correct as far as the actual implementations go. As a techni

That is the "x86 on RISC-ish core" interpretation of term microcode, which is probably not exactly correct as far as the actual implementations go. As a technical term, microcode is contents of memory that is used to implement CPU sequencing (in contrast to doing sequencing in hardwired random logic or having essentially no sequencing logic as is the case in classical RISC designs). In most straightforward implementation it's essentially turing machine with microcode as state table and tape replaced by rest of the CPU. Various enhancements and modifications are possible which end in having essentially full-blown CPU for processing microcode, but even in that case one thing is critical for the term: the microcode only handles control functions (sequencing) and does not directly process data.