microcontrollers Keil C51 MCS 51 instruction set Compiler User Guide list microcontrollers base on 8051 series similar family MCS 51 instruction set

 http://ee.cleversoul.com/8051-compilers.html

https://www.keil.com/dd/chips/megawin/8051.htm 

https://docs.platformio.org/en/latest/platforms/intel_mcs51.html