When I first began to design computers for IBM, the idea of software compatibility was unimportant. If software had to be rewritten in order to run on a new generation of computers, that was OK. Business users in the 1970s, however, made it clear to IBM and other computer vendors that compatibility was important. Their major investments were in software applications, and these applications had to run on the next generation of hardware. Not only did existing applications have to run, they had ...

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