What was your BEST tech purchase ever?

Okay, let’s go way back then.
My Netronics Elf II was my first computer, and a kit I built. It had TV graphics (the Enterprise shown in the photo), and I taught myself to program machine language for its 1802 processor. I went on to build a 2k memory expander, wrote animations, music and games for it, used it as a phone dialer, etc. It got some love a couple of years ago at a retroTECH exhibit at Georgia Tech where I’m working on my PhD. This purchase influenced the rest of my life.

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