Comment by woolion

The paper "Making Turing machines useful (Or, how I got Doom to run on a Turing machine)" builds a Turing machine to run Doom (duh), by implementing a RISC-V (RV32I) emulator. While in Sigbovik fashion the utility of the exercise is far outshined by its complexity, there's a number of interesting choices regarding much of what are usually handwaved away regarding tape and state management. To be fair, TM have far less utility as real programming languages than lambda-calculi do, so it's common for professors to dismiss any attempt to optimize TM programs -- which is a root of evil. Since evil is also the source of doom, everything converges here.