Check the listing for details. MS-DOS 3.3 REFERENCE MANUAL FOR EPSON. Listed at 14.99 USD. The MS-DOS 3.3 Reference Manual for Epson is a vintage user manual specifically designed for Epson computers. This manual provides detailed instructions and information on how to use the Epson operating system, allowing users to fully utilize the features and capabilities of their vintage computing devices. With a focus on the Epson brand, this reference manual serves as a valuable resource for those looking to enhance their vintage computing experience.