Special menu
1) Start the game while holding all numeric keys between 0-7 (usually not possible with emulators), or
2) start the game, swap the game disk with a formatted blank disk during the opening, push SPACE to open a menu dialog, swap the disk with the game disk, then choose the second Continue menu to open the following menu where you can jump to a specific part of the story, erase the save data or listen to music. Note the blank disk is not truly blank after using this cheat therefore must be reformatted before retrying.