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/* Microcode */
To execute a machine instruction, the computer internally executes several simpler micro-instructions, specified by the microcode. In other words, microcode forms another layer between the machine instructions and the hardware.
The 8086's microcode ROM holds 512 micro-instructions, each 21 bits wide. Each micro-instruction performs two actions in parallel. First is a move between a source and a destination, typically registers. Second is an operation that can range from an arithmetic (ALU) operation to a memory access. See: [https://www.righto.com/2022/11/how-8086-processors-microcode-engine.html How the 8086 processor's microcode engine works]
== Hybrid Design ==
