Yeah...I get the same handwavey number for ARM &amp; MIPS; its a crazy successful market.  And it&#x27;s clear that 32-bit is the future, for some value of future.<p>That said, trying <i>just</i> to understand how many 8051 derivatives is almost impossible.  There are many dozens of vendors who supply chips, cores &amp; other embedded IP, many of whom don&#x27;t even call it 8051 any more.  There&#x27;s probably a few tens of them within 100 feet of you.  Much less the 20 or so other significant 8-bit families.<p>It&#x27;s a shame that hard data is only available from high dollar market research firms, but I suppose they did the legwork and deserve something for the work.