Interesting, just stumbled on this; evidently the ground-breaking HyperCard software that the amazing Bill Atkinson created had earlier roots in an iPad-like device that would emulate books at a closer level in the early 1980s, named the Magic Slate:
There's not much information on what this Magic Slate device was. There's another reference in the classic HyperCard book The Complete HyperCard Handbook (1987) with an interview with Bill Atkinson, written BTW by the early JavaScript pioneer Danny Goodman:
The final reference to the Magic Slate I can find is from a Wired magazine article by the ever great Steven Levy, in only the tenth issue of Wired magazine in 1994. The article is titled Bill and Andy's Excellent Adventure II and focuses on the ill-fated General Magic appliance:
Bill [Atkinson]'s problem with his employer's oversight was not so much ego, as a matter of his deeply ingrained sense of fairness. Bill has a radar for the personal angle, and the idea of one person gaining an unearned edge over another is loathsome to him. One-on-one he is an intense communicant. Bill is an eye-contact person, giving you total attention, really wanting to know how you are doing, how you are feeling. He hugs. And he thinks that "business as usual" is no excuse for not doing what's right.
The second thing crucial to Bill is his need to get his products out into the world. He bears scars from those times when a project of his failed to reach the public. He loved the idea that Apple bundled his MacPaint with every Macintosh, and he was crushed when the company decided that his post-Mac project, a flat-pad communicating computer called Magic Slate, was too esoteric a product to begin developing in 1985. He went into a depression, not working for months, until one night he wandered out of his house in the Los Gatos hills, stared at the star-filled sky, and had an epiphany: In the face of the awesome celestial epic, what was the point of being depressed? All you could do, really, was use your abilities to do what you could to make a little part of the universe better. And Bill Atkinson went back into the house and began using his abilities to work on a new project that would become known as HyperCard.
I reached out to Bill to ask him if he had any more details on the Magic Slate; this is what he said over email:
Magic slate was still just in the ideas stage. I made some drawings and notes about how it would work, but we never had an actual working prototype. Yes, it was one of the conceptual ancestors of the iPad, but so was Alan Kay's DynaBook.
It's too bad that the iPad, which is the actual instantiation of the Magic Slate more than 25 years later, still doesn't have something like HyperCard, which would truly empower everyone to create interactive content and software.
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