The last Apricot computer not to be IBM compatible was the XEN (October 1985), a 286-based system intended to compete with the IBM AT and running Microsoft Windows (now known as Windows 1.0). It was superseded in 1986 by the XEN-i, the first in a line of IBM-compatible systems. The Xen-i initially shipped with a 5.25" floppy drive to further improve its IBM-compatibility. The 3.5" drive made a reappearance when IBM themselves switched formats with the release of the PS/2 range.