Before we dive into the pins and registers, let's address why you should care about a 40-year-old chip.
The 8086 datasheet outlines a processor designed for high-performance 16-bit computing within a 40-pin DIP package: 8086 datasheet
Note: Variants exist. The 8086-2 runs at 8MHz; the 8086-1 at 10MHz. Always check the full part number on the datasheet. Before we dive into the pins and registers,