The prof's home page is pretty interesting, see the rest of the arithmetic tutorial series or anything in the "research areas"
He's also the author of the punch card meta-information format which is pretty interesting WRT digitization of historical archives. As you can imagine, given the idea of a piece of cardstock of some size with marks and holes, there is an almost (but not quite) infinite way of representing information. Of course only some possibilities were ever widely implemented. Thats a funny traditional step along the education of a retrocomputing hobbyist, "what you say there's more than one punch card format" LOL. I would imagine in 100 years they'll be saying the same thing about unicode, or perhaps graphics image files...
He's also the author of the punch card meta-information format which is pretty interesting WRT digitization of historical archives. As you can imagine, given the idea of a piece of cardstock of some size with marks and holes, there is an almost (but not quite) infinite way of representing information. Of course only some possibilities were ever widely implemented. Thats a funny traditional step along the education of a retrocomputing hobbyist, "what you say there's more than one punch card format" LOL. I would imagine in 100 years they'll be saying the same thing about unicode, or perhaps graphics image files...