It was supposed to be released to run on Z80 machines. Apparently it was killed when Smalltalk-80 was starting to be released (if Ted Nelson is to be believed):

It was supposed to be released to run on Z80 machines. Apparently it was killed when Smalltalk-80 was starting to be released (if Ted Nelson is to be believed): https://archive.org/details/RosettaBrochure/RosettaBrochure/page/n0/mode/2up https://archive.org/details/RosettaBrochure/RosettaBrochure/...