Editing Intel 8086 (section)

===Background===
In 1972, Intel launched the [[Intel 8008|8008]], Intel's first 8-bit microprocessor.<ref group="note" >using enhancement load [[PMOS logic]] (requiring 14&nbsp;[[Volt|V]], achieving TTL compatibility by having V<sub>CC</sub> at +5&nbsp;V and V<sub>DD</sub> at −9&nbsp;V).</ref> It implemented an [[instruction set]] designed by [[Datapoint|Datapoint Corporation]] with programmable [[Computer terminal|CRT terminals]] in mind, which also proved to be fairly general-purpose. The device needed several additional [[Integrated circuit|IC]]s to produce a functional computer, in part due to it being packaged in a small 18-pin "memory package", which ruled out the use of a separate address bus (Intel was primarily a [[DRAM]] manufacturer at the time).

Two years later, Intel launched the [[Intel 8080|8080]], employing the new 40-pin [[Dual in-line package|DIL package]]s originally developed for [[calculator]] ICs to enable a separate address bus. It had an extended instruction set that is [[source-compatible]] (not [[binary compatible]]) with the 8008<ref>{{Cite web
  |website=CPU World
  |title=8080 family
  |url=https://www.cpu-world.com/CPUs/8080/
}}</ref> and also included some [[16-bit computing|16-bit]] instructions to make programming easier. The 8080 device was eventually replaced by the [[Depletion-load NMOS logic|depletion-load]]-based [[Intel 8085|8085]] (1977), which used a single +5&nbsp;V power supply instead of the three different operating voltages of earlier chips.<ref group="note">Made possible with depletion-load nMOS logic (the 8085 was later made using HMOS processing, just like the 8086).</ref> Other well known 8-bit microprocessors that emerged during these years are [[Motorola 6800]] (1974), [[PIC microcontroller|General Instrument PIC16X]] (1975), [[MOS Technology 6502]] (1975), [[Zilog Z80]] (1976), and [[Motorola 6809]] (1978).