The Intel 8088 (and its big brother 8086) processor was among the first microprocessors to implement (instruction) prefetching in hardware, which [Ken Shirriff] has analyzed based on die images of ...

Microcode is a feature of many modern CPUs. The CPU runs several “microcode” instructions to process a single opcode. For the Intel 8086, there are 512 micro instructions, each with 21 bits.