Columbia Data Products 1600 VP Tutor Released in 1983 by Perfect Software/Columbia Data Products For Columbia Data Products VP portable computers. This is a bootable tutorial disk intended for use with the Columbia Data Products VP portable computer. The "Tutorial" is little more than a set of text files, but contains usage information specific to DOS and CP/M on the CDP VP portable. This archive contains one 320K (DSDD 8-sector) disk image. Note that this a DOS 1.x formatted disk, therefore WinImage will not open it.