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.
The Wall Street Journal investigates major corporations' ad buyers' practice of blacklisting of ads on news stories that deal with the world's most urgent issues, including any news story that contains the word "Trump" or "racism" or "gun" or "Brexit" or "suicide" (so much for reporting on the opioid epidemic).
For more than a decade, consumer rights groups (including EFF) worked with technologists and companies to try to standardize Do Not Track, a flag that browsers could send to online companies signaling that their users did not want their browsing activity tracked. Despite long hours and backing from the FTC, foot-dragging from the browser vendors […]
The next version of Chrome will patch a bug that lets websites detect users who are in incognito mode by by probing the Filesystem API; they've also pledged to seek out and block any other vulnerabilities that will let servers detect users in incognito mode.
It’s a great time to be a maker. 3D printers are on store shelves for anyone to buy, and coder kits like Arduino and Raspberry Pi are letting kids as young as 9 or 10 dive into the Internet of Things. Here are a few examples of our favorite tech toys, all priced low enough […]
Want to make a hit? The right software is out there for anyone, but any music producer will tell you that finding the right sound can still take time and talent. Still, the right tools are a great shortcut, which makes this Synth & Sound Pack Bundle absolutely priceless. And now that it’s on sale […]
Let’s face it: People at the gym aren’t bragging about their headphones. If they were that great, they’d be listening to them instead of talking about them. So while we’re sure those new PowerBeats Pro earbuds are something special, why would you shell out $250 for a tiny pair of speakers when comparable ones are […]