<prompt> Refer to the passage below and then answer the question afterwards in the same language as the passage: Passage: Pakati pemakore ekuma1980, Microsoft neIBM vakaumba chirongwa chakabatana chekugadzira chizvarwa chinotevera che graphical operating system; mhedzisiro yaive OS2 neHPFS. Nekuti Microsoft haina kubvumirana neIBM pazvinhu zvakawanda zvakakosha, vakapedzisira vaparadzana; OS2 yakaramba iri chirongwa cheIBM uye Microsoft yakashanda kugadzira Windows NT neNTFS. Mubvunzo: Microsoft neIBM vakabatana muchirongwa chipi pakati pemakore ekuma1980?  <response>: OS2 uye HPFS 