You could make every operation of the form (op src dst nxt). Something like https://codegolf.stackexchange.com/questions/11880/build-a-working-game-of-tetris-in

You could make every operation of the form (op src dst nxt). Something like https://codegolf.stackexchange.com/questions/11880/build-a-working-game-of-tetris-in-conways-game-of-life https://codegolf.stackexchange.com/questions/11880/build-a-w..., where results are always written to ram and 'register' indexes are just addresses. You'd still need some transient/architectural registers to hold the current instruction/memory address/alu input-output on its way though the cpu though.