In 1981 when the original IBM Personal Computer was announced,
IBM released three operating systems for it. How many of you remember that?
Since I wrote the first IBM course on how to fix this original PC, I had to know
at least a little about all three of them.
IBM decided early in the development process of the PC that they
did not want to hire a bunch of programmers to write software for it -
especially an operating system. IBM wanted the hardware business and did not
care about the software. Since there was no clear-cut contender for an operating
system at the time, IBM approached three organizations about writing one for the