02-21-2006
It's not. I have used 16 bit versions of unix. Now it's a split between 32 and 64 bit versions of unix. I believe that there was once a 24 bit version, but I don't remember for sure. Can anyone confirm? Any others?
Considering only the 32 bit versions of unix, the primary reason that they were a 32 bit implementation was that they were running on a 32 bit CPU. A few people run 32 bit unix on 64 bit CPU's. At first, this was because the manufacturer had not yet finished the 64 bit os and the 32 bit was the only choice. Some people continue to 32 bit versions of unix on a 64 bit cpu. There is no easy explanation for this. Some people still use 80 column cards too.
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