8086-Derivatives and clones

Derivatives and clones
Soviet clone KP1810BM86.
OKI M80C86A QFP-56

Compatible and, in many cases, enhanced versions were manufactured by Fujitsu, Harris/Intersil, OKI, Siemens AG, Texas Instruments, NEC, and AMD. For example, the NEC V20 and NEC V30 pair were hardware compatible with the 8088 and 8086, respectively, but incorporated the instruction set of the 80186 along with some (but not all) of the 80186 speed enhancements, providing an drop-in capability to upgrade both instruction set and processing speed without manufacturers having to modify their designs. Such relatively simple and low power 8086-compatible processors in CMOS are still used in embedded systems.

The electronics industry of the Soviet Union was able to replicate the 8086 through both industrial espionage and reverse engineering. The resulting chip, K1810BM86, was pin-compatible with the original Intel 8086 and had the same instruction set. This IC was the core of Soviet-made PC-compatible ES1840 and ES1841 desktops. However, in hardware these computers had significant differences from their authentic prototypes (respectively PC and PC/XT): the K1810BM86 was a copy from Intel 8086, not Intel 8088, and the data/address bus circuitry was designed independently of original Intel products.