Computing Systems
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I also used an electronic calculator for many of my project calculations, the Texas Instruments SR-10 (a Christmas gift to our family from Santa in 1972 - the SR stood for 'slide rule' and it was only the second ever calculator model from TI, priced at $150 - a fortune then):
Later in high school I saved enough money to purchase my very own HP-25C (using the famous and efficient RPN - reverse polish notation, which I loved):
Forward to my stereo/audio systems over the years - projects and purchases
Forward to our live music jamming setup