8kLisp
Alexander Burger. 8kLisp. CP/M program, circa 1986-1987.
From the Computer History Museum's Software Preservation Group archive, [8kLisp][8kLisp. CP/M program, circa 1986-1987].
The last version of the immediate predecessor of PicoLisp, an 8bit version for Z80 called 8kLisp. The filestamps are preserved from when the files where copied from CP/M (1986 and 1987, CP/M didn't have such meta data), and the explicit dates in the sources are from March 1986 through June 1987.1
The version from the archive is missing the if, when, and unless functions, and has an undocumented do function.