Check the listing for details. 1993 GT Software Corp. Good times Software Lets Learn Dos.. Listed at 20.00 USD. The 1993 GT Software Corp's Good Times Software Lets Learn DOS is a vintage software program designed to teach users how to use the DOS operating system. Developed by GT Software Corp., this educational software aims to help users learn and improve their skills in using DOS in a fun and interactive way. Back in the era of vintage computing, this product offered a unique and innovative approach to training and education in the field of computer technology.