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Assembly language is language which gives the programmer direct control over the computer. That is what appeals to people about assembly language. It is like using a stick shift. Programming with other languages, high-level languages, is like using an automatic.

Many people who use computers simply run programs. To them a program is a canned software package. People who like to write programs like to be able to shape the behavior of the machine the way metalsmiths shape metal into useful mechanical tools. Amongst all the programs on a computer, there is one program which runs the machine: the operating system. It controls everything. It offers "services" to the other programs. Most operating systems force programmers to leave their programming skills behind as they approach the operating system and to use it as they would a canned software package. That is because its source code is a secret. Linux portends the end of secret code in computing. Because the Linux source code and a compiler for it are left there on the computer along with the other source code, it allows programmers to work with the operating system as they do with programs they have written.

Operating systems were once written by programmers employed by computer manufacturers. Revolutions in hardware produced corresponding revolutions in the software. When Linus Torvalds rewrote Linux so that it would run on the Alpha architecture, his goal was not to increase its hardware base from one platform to two, but to make Linux platform-independent. The subsequent ports of Linux, to everything from a Sparc to a PowerPC, demonstrate the success of his rewrite.

The chief value of it is that it provides us with confidence that Linux is here to stay. We don't have to fear a PowerPC revolution coming along and forcing us to dump all of our old software.

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