One INS8073/N - NATIONAL - 40pin CPU w/Basic Microprocessor.  These are super rare from my collection.  They are unused and working 100% and come from my stock here in the USA.  We do not sell Chinese Counterfeit junk.  All the info you could want to know about this rare processor is below.

https://8073sbc.wordpress.com

http://cini.classiccmp.org/pdf/NatSemi/INS8073_DataSheet.pdf