1h BbFabHbBbbBf BbEbBbb G16bBe A loop generating all bytes (?) in dontmove. How do we increment a counter f? Easiest is to zero the subtractor (Bb), load it negative (Fb), decrement (Hb), and negate (Bbb) before updating (Bf). The next line is an unconditional backward jump, using the subtractor to subtract 16 from the program counter E. Pipe to `aplay` to hear a sawtooth wave.