I remember to have read in a old Elektor issue about one 8052AH-BASIC micro controller that had a BASIC interpreter in its ROM. In fact in the same article there was a method described to download the BASIC interpreter on to a EPROM!!

My efforts to source it some ten years back had failed. At that time it was quite appealing to be able to directly "write" to a MCU in BASIC language. But that wish was never to be.

I dont know if any forum member has used it or has had access to it.

Raghu