The Rekursiv Chip–A Smalltalk Machine (opens in new tab)

iirc not a Smalltalk machine -- a Lingo machine.

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1988 "REKURSIV Object-oriented Computer Architecture"

https://www.google.com/books/edition/REKURSIV/f0MsAQAAIAAJ

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1988 "LINN REKURSIV: A PERSISTENT OBJECT COMPUTER"

https://www.researchgate.net/publication/243546728_Rekursiv_...