Talk:IBM Portable Personal Computer
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Connection to the XT
The Portable was not a big seller due to the public's confusion over what it really was: It should have been called the Portable XT, which would have been more accurate. "Portable PC" implied the earlier PC technology, which led consumers to believe it was less advanced than it actually was.
Until 1985, All "PC/XT"'s sold had hard drives, it was one of their biggest selling points next to the original PC that they kept on the market for a number of years after introducing the XT.
The portable was never offered with a factory hard disk (you could add one, I had a seagate st225 in mine), only had 5 slots (like the original PC, the 'XT' had 8).
It is true that it used an XT-derived motherboard (with 5 slots instead of 8, an XT ROM, and no casette port), but this was NOT an "XT" in IBM-marketing-speak.
Personally, I think offering it with a hard disk and THEN calling that model "The Portable XT" might have met with more market success than they had, but that is just my speculation. The machine was still quite inferior to Compaq's offerings at the time, a factory HDD might have helped, but....</my2cents>