Thanks Bakers
excuse all the wikis.. just for intro
https://en.wikipedia.org/wiki/Ternary_numeral_system
https://en.wikipedia.org/wiki/Balanced_ternary
https://en.wikipedia.org/wiki/Balance_puzzle
for coders:
https://en.wikipedia.org/wiki/Nikolay_Brusentsov
Dialogue System of Structured Programming (DSSP). DSSP emulates the "Setun 70" architecture on binary computers
https://github.com/trinarium/DSSP-C
http://brokestream.com/daf.txt
DSSP (Dialog System for Structured Programming) was
created in the laboratory of Brousentsov N.P. at the Computer
science department of the Moscow State University in 1980,
contemporary version - in 1985, 32-bit version - in 1989.
Setun-70 is a ternary minicomputer with a two-stack
architecture. From it DSSP inherited control constructions and the
basic idea: programming without a semantic gap.
From Forth DSSP inherited the idea of vocabulary and the method
of notation of procedures between ":" and ";" .