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With the intriquing name SUPERKIM an engineer called Paul Lamar designed a SBC around the 6502.
The main design decisions were to be a superset of the KIM-1, requiring no alteration of KIM-1 programs or user interface (the keyboard/display!) but with much more extendable resources. And the result is just right, it Is a KIM-1 with many improvements!

Read all I know here!