I was thinking of unix style OS's. The 286 was the
first intel cpu
with some sort of real memory managment.
If you don't count the iAPX 432. (And most people don't.)
Well what was it?
Maybe your friend Google knows? :-)
Intel's first 32-bit microprocessor, announced in 1980 and first
shipped in 1981. The 432 was object-oriented, implemented kernel
primitives such as memory and process management in microcode, offered
nearly glueless SMP support, and had support for redundancy and
fault-tolerance.
The main CPU was called the General Data Processor (GDP), and consisted of
two chips, the 43201 instruction unit and the 43202 execution unit. The
original plan called for an I/O Processor, but that was replaced by the
43203 Interface Processor (IP), which was not a processor in the
conventional sense of the word. The IP acted as a proxy into the 432
world for a more conventional I/O processor.
The 8086 was developed as a stopgap measure because the 432 program
(originally to be known as the 8800) was several years behind schedule.
Most 432 systems used 8086 or 8088 processors in the I/O subsystems.
http://www.brouhaha.com/~eric/retrocomputing/intel/iapx432/
