Intel 8051 definition processor
developed by Intel
in 1980 for use in embedded
products and still (1999) one of the most popular microcontrollers.
The 8051/8031 cores
are used in over 100 devices from 10 independent manufacturers such as Dallas and Philips.
[What is the difference between the 8031/8051/8052?]
See also CAS 8051 Assembler
8051 FAQ (http://ece.orst.edu/~pricec/8051/faq/index.html).
The 8031/51 series microcontroller (http://rehn.org/YAM51/).
Intel MCS51 series microcontrollers (http://intel.com/design/mcs51/).