Check the listing for details. IBM 1983 Disk Operating System Users Guide by Microsoft Corp. Vintage Computer M. Listed at 29.95 USD. This IBM Disk Operating System User's Guide by Microsoft Corp. offers a comprehensive look at DOS functionalities. Ideal for collectors and enthusiasts of vintage computing technology, it provides historical insight into early operating systems. • Vintage computer manual • Detailed user guide • Collectible item • Preserved in plastic wrapping • Historical significance New original sealed package All items we collect get sanitized, cleaned, laundered (if possible). Items such as leather bags and footwear undergo cleaning with proper earth friendly products and leather conditioners to ensure your products arrive to you in the best condition possible. We ship Monday-Friday and diligently package, so your items arrive safe and protected.