WHAT IF WE BEGAN the story of digital art not with a screen but with a canvas? In the first room of the exhibition “Coded: Art Enters the Computer Age, 1952–1982” at the Los Angeles County Museum of Art, visitors are confronted by I.B.M. Disc Pack, a large grisaille painting of six thin, industrial-looking disks stacked on a spindle. As the title indicates, this 1965 work by Lowell Nesbitt—which evidences Pop art’s fascination with commodity fetishism while anticipating the sometimes frigid Photorealism of the 1970s—offers a close-up view of the spinning magnetic hard disks IBM invented in the