Sunday, September 6, 2009

Derivatives and clones(8086)

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 a 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 (К1810ВМ86 was a copy of the Intel 8086, not the Intel 8088) and had the same instruction set. However this IC was metric and was not mechanicaly compatible with the Intel products. The Intel microprocesoors I8086 and I8088 were the core of the Soviet block-made PC-compatible ES1840 and ES1841 desktops. However, these computers had significant hardware differences from their authentic prototypes (respectively PC/XT and PC): ES1840 was Intel 8088 based, ES1841 was Intel 8086 based. Also, the data/address bus circuitry was designed independently of original Intel products. ES1841 was the first PC compatible computer with dynamic bus sizing (US Pat. No 4,831,514). Later some of the ES1841 priciples were adopted in PS2 (US Pat. No 5,548,786) and some other machines (UK Patent Application, Publication No. GB-A-2211325, Published Jun. 28, 1989).

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