Many of the architectural features of the J1 processor design originate in Philip Koopman's Stack Computers: the new wave,
which orients the design of the NOVIX NC4016,
another 16-bit architecture significantly resembling the J1,
within a broader taxonomy of stack machine processor designs.
References
Philip Koopman — Stack Machines: the new wave (1989) 4.4 ARCHITECTURE OF THE NOVIX NC4016 (ece.cmu.edu)
,citation
James Bowman J1: a small Forth CPU Core for FPGAsexcamera.com
relative ease of implementation, and consequentially of adaptation and extension.
https://github.com/jamesbowman/j1
P. J. Koopman, Jr., Stack computers: the new wave. New York, NY, USA: Halsted Press, 1989
variants include
Richard James Howe, H2, rewritten in VHDL, a C emulator, cross-compile bootstrap with gforth github.com
Steffen Reith J1Sc, rewritten in Scala/SpinalHDL, steffenreith.github.io
https://github.com/stacksmith/cl-j1