The splash image is a throwback to the early IBM PC DOS manuals which are freely available on pcjs [1]. Very entertaining to read these high quality manuals, especially the ones for 1.0 and 2.0. You can tell a lot of work went into refining those documents for an audience who barely had any idea what a computer was. They even have a bit of internal details (e.g. about FAT) and such at the end.