The Free On-line Dictionary of Computing (30 December 2018):

Intel 8051
8031
8051
8052

    A microcontroller 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, as31 assembler, 51forth.

   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/).

   (1999-11-21)