ocr: Tou use the Microsoft Mouse version 2.0, you need: APCor compatible with: MS-DOSE operating system version 2.11 or higher 3.5" High Density disk drive Serial or PS/28 compatible mouse port - MDA, CGA, EGA,VGA,SVGA, XGA or VESA VCI-compatible video driver VGA or higher resolution monitor For IntelliPoint software, Microsoft Windows" operating system version 3.1 or later Product contains 3.5" High Density disks, 5.25" High Density disks are available through an enclosed coupon.