It's now very easy to implement an open collector bus , since you just switch between 0V output and input to get the two desired states. Ah and if you want to be able to detect a shortage on the line, you'll also need to be able to check if high is really high. It would have been much better when the chip designers had used different bytes for the data of the ports for the input and the output functions of the port . When you're looking for a serious amount of scarce chips click this. Besides 'open source software ' there are also project groups working on 'open source hardware '.
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They further say, that a lot of unsuccessful experiments tried this before, but they have now made it. The money comes from the Naval Research and Army Research Office. The upcoming AMD Athlon SocketA Thunderbird processor with performance enhancing cache memory, cooled to a chilly -40 C will give you the high performance processing power you could only imagine until now. Processors Faster processors from Intel to replace older slower ones. When you're looking for a serious amount of scarce chips click this.