## M Puzzle: Less Engineering, Dammit!

### by Gregg Favalora

The schematics describe a system that makes horizontal and vertical line segments coast from left to right, wrapping around a 16-character display. The data come from three components called "shift registers," which control individual lights (LEDs) within each character. A description is included as an imaginary data sheet.

The visual flow for each "pixel" in time:

U1 controls the top 3 LEDs for each character; U2 does LEDs 10 and 4 for each character, and U3 handles LEDs 1 and 2. This will be obvious to an electrical engineer.

It is assumed the solver will make a simulation in C and watch the output in a monospace XTerm window. If patient, the answer will appear at the 96th time step for R1=1k and R2, R3=2k. (To prevent the answer from being obvious, I shifted the final state data for Shift reg2 and Shift reg3 by 16 bits.)

 INITIAL STATE Shift reg1: 111 100 101 110 001 110 001 110 100 000 101 110 000 000 110 000 Shift reg2: 10 00 00 10 10 11 10 10 10 11 11 11 01 00 01 11 Shift reg3: 11 00 01 11 10 10 11 10 10 10 01 01 00 11 00 01 FINAL STATE (Timestep 96 for R1=1k, R2=2k, R3=2k) Shift reg1: 111 100 101 110 001 110 001 110 100 000 101 110 000 000 110 000 Shift reg2: 10 11 11 11 01 00 01 11 10 00 00 10 10 11 10 10 Shift reg3: 10 10 01 01 00 11 00 01 11 00 01 11 10 10 11 10

In the final state, the following appears:

In other words--in Harvey Twyman's LCD font--"Physicist Werner." The answer is HEISENBERG.

Training:

The clear reference to "knitting" in the last line of the flavortext gives the training puzzle, Knitting. In spite of the suggestions that the untrained/trained answer is AUTHORITARIANISM/"Fearful Symmetry" (or LIBRARIAN/Travelers, say), the trained answer is actually MIND'S EYE.