tangaloomababe

Hi all. I have recently returned to playing DOTT and have found past information provided on this site invaluable. Have been able to run the game in XP using Scummvm (what a great program) but have just one problem. I cannot save games, neither F1 or F5 respond. I would love to be able to play this game again but not in one day, which means I need to be able to save. Can anyone help please?!!!!!