subtraction is trivial to add in userspace once you've loaded it though : - sp@ @ nand 1 + + ; or as it appears in the hello_world.FORTH file : dup sp@ @

subtraction is trivial to add in userspace once you've loaded it though : - sp@ @ nand 1 + + ; or as it appears in the hello_world.FORTH file : dup sp@ @ ; : invert dup nand ; : negate invert 1 + ; : - negate + ; There is of course no benefit to this thing at all other than reclaiming the crown from those deviant lispers... well I suppose if you're making a your own computer from scratch like https://www.homebrewcpuring.org/ https://www.homebrewcpuring.org/ it might be a useful starting point.