808x > FujitsuMBL8086-1
Modified: May 25, 2005, 3:23 am
Data Code:8634
Process:1 Micron
Architecture:16 bit
Used in:Computers
Description:Intel 8086 microprocessor is a first member of
x86 family of processors. Advertised as a "source-
code compatible" with Intel 8080 and Intel 8085
processors, the 8086 was not object code
compatible with them. The 8086 had complete 16-
bit architecture - 16-bit internal registers, 16-
bit data bus, and 20-bit address bus (1 MB of
physical memory). Because the processor had 16-
bit index registers and memory pointers, it could
effectively address only 64 KB of memory. To
address memory beyond 64 KB the Intel 8086 used
segment registers - these registers specified
where code, stack data and extra data 64 KB
segments are located within 1 MB of total
processor memory. To accommodate this awkward
memory addressing many 8086 compilers included 6
different memory models: tiny, small, compact,
medium, large and huge. 64 KB direct addressing
limitation went away with the introduction of the
32-bit protected mode in Intel 80386 processor

Fujitsu was a main Intel second source.