Driving YM2149F sound chip with an Arduino

A few months ago, I had the opportunity to get a Yamaha YM2149F chip. This chip is basically a clone of General Instrument's AY-3-8910, "a 3 voices programmable sound generator" widely used in the 80's in many arcade games and home computers (including the Atari ST and Amstrad CPC).

The …

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Arduino Hello World without IDE

There is already a number of resources available about programming the Arduino with or without the IDE (I won't discuss here the pros and cons of using it). This aims at being a quick memo for those who already have some knowledge about C programming, and just want the minimal …

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Inkjet versus laser printer

Contrary to what I found on most websites when googling about comparisons between inkjet and laser printers, the cost per page on high end inkjet printers is lower than that of laser printers.

Moreover, when buying a new printer one has to consider the number of pages that will be …

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Splitting Swift cluster

At Cloudwatt, we have been operating a near hundred nodes Swift cluster in a unique datacenter for a few years. The decision to split the cluster on two datacenters has been taken recently. The goal is to have at least one replica of each object on each site in order …

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OpenStack Swift Ring made understandable

When people talk about OpenStack Swift, we often hear the word Ring. This is because the Ring is a central piece in how Swift is working. But what is this thing everyone's talking about ?

The Ring refers to 3 files that are shared among every Swift nodes (storage and proxy …

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