Abstracting transistors into high-level design

Although it’s not the best way of understanding computers, most people tend to imagine electronic devices as black boxes filled with magic and blue smoke. Even microcontrollers, the most fundamental means of computation, are treated like little black plastic centipedes with metal legs. In a series of blog posts, [Andrew Gibiansky] is tearing down the walls of obfuscation and illuminating the world of transistors, gates, and FPGAs.

The first blog post goes over the idea of electronic circuits as a waterfall; a positive voltage is a reservoir on a mountain top and ground is sea level. This idea is extended to the lowly transistor acting as an electronic switch, able to turn a circuit on and off.

Continuing on to logic gates, [Andrew] covers the NOT, AND, and OR gates before moving on the flip-flops and SRAM. These can, of course, be modeled in Verilog and VHDL – programming languages that abstract the world of transistors and gates into a much more human-readable form.

[Andrew] is far from done with his series of blog posts, but judging from his work so far it seems to be a great resource for untangling the obtuse concepts of gates and memory into the coherent design of a computer.

Map abstraction API in Javascript


Maybe you’ve tinkered a bit with the Google Maps API. Most of the software produced with it is not all that useful or entertaining, but a few gem have shone through. Still, wouldn’t it be better if applications produced with it could be easily ported to other online mapping services like Mapquest or Yahoo! Maps?

This is possible with Mapstraction, a Javascript API that works with nine mapping services and plans to incorporate more into the fold. Mapstraction has open-source features that normalize functions across the biggest services, which makes searching for map data a consistent, predictable experience no matter which service you use.

Some of Mapstraction’s current features are what you would expect: point, line, and polygon support, image overlay, GeoRSS and KML feed importing, and several others. We’re really looking forward to future versions with OpenStreetMap support. Currently Mapstraction works with only commercial mapping services, but OpenStreetMap combined with Mapstraction directly hits the sweet spot; a customizable, open source map.

[via Hackszine]

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