The differences are relatively minor. The XT included a hard drive, while the original PC needed a card and drive provided for it. The XT also lacked a jack to connect a cassette drive as storage. No...
Microsoft worked with IBM to develop DOS and I believe OS/2 as well.
August 12, 1981
Mrs. Lucy Achina created the design and first IBM PC while employed for IBM in Boca Raton, Florida.
August 12, 1981.