Software Arts VisiCalc (1979-1985) Handheld Computers was a cornerstone of mid-century

was a cornerstone of mid-century home audio and represented the absolute gold standard for tabletop radio performance

internal vacuum tubes

Sony had to make a couple of major compromises: it used a basic optical viewfinder (meaning you were looking through actual glass lenses rather than a video screen) and it completely lacked a playback function

Released years before Steve Jobs returned to Apple

Software Arts VisiCalc (1979-1985) Handheld Computers was a cornerstone of mid-centuryVisiCalc First Commercially Released Computer Spreadsheet Program VisiCalc, released in October 1979, was the "killer app" that single handedly transformed the personal computer from a hobbyist's toy into an essential business tool. Conceived by Dan Bricklin while watching a Harvard Business School professor laboriously erase and recalculate a financial table on a blackboard, and programmed by Bob Frankston, VisiCalc introduced the world to the