It was high-tech encryption for an important period of time in the mid-1940s, so perhaps you can forgive us our obsession with the Enigma machine. But did you know that you can make your very own ...

According to the spec, extal was to run at 40 MHz. Everything was passing on simulation, but JTAG output pin (TDO) started to fail on frequencies > 25 MHz on tester. The shmoo for the same can be seen ...