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ab3ap
The first computer I used was a PDP-11/70 running RSTS/E in high school in the late 1970s. The terminal was a DECwriter with 300 baud dialup, yet so addictive that I probably killed a few trees along the way!
These days, I work in an RF lab doing radio work and linux-based python programming. Mainly, I implement DSP and control of lab equipment to automate testing.