Avi sez, "The Digi-Comp 1 toy kit was a cool hands-on way to learn the basics of computing. The Digi-Comp 1 emulator is an interim substitute for those who can't get their hands on one."
In essence the Digi-Comp I contains three mechanical flip-flops and provides an ability to connect them together in a programmable way using thin vertical wires that are either pushed, or blocked from moving, by a number of cylindrical pegs. The whole arrangement is 'clocked' by moving a lever back and forth. Different configurations of these cylinders cause the Digi-Comp to compute different boolean logic operations. With a three binary digit (3-bit) readout of the state of the flip-flops, it can be programmed to demonstrate binary logic, to perform various operations such as addition and subtraction and to play some simple logic games such as Nim.
See also the magnificent CARDIAC, the cardboard teaching computer produced by Bell Labs.
D I G I - C O M P 1
A pair of social scientists from UCSD and Yale conducted an NIH study published in the American Journal of Epidemiology on the link between Facebook use and mental health, drawing on data from the Gallup Panel Social Network Study combined with “objective measures of Facebook use” and self-reported data for 5,208 subjects, and concluded that […]
Dominic Tarr is a developer who lives on a self-steering sailboat in New Zealand; he created Scuttlebutt, a secure messaging system that can run without servers, even without ISPs.
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