[Dalrymple]

Despite his wealth, Bill's father reportedly ran the slide projector for Bill's talk in the early days of Comdex. In those pre-powerpoint days a draftsman created a paper version of the "viewgraphs" which were photographed and then displayed with a slide projector or on a overhead projector. The overhead projector used a "burned" transparency created by putting a special type of transparency film instead of paper in a xerox machine and copying the draftman's original.