This is a patched version of bigclock for the Treo 600. Be aware that I have not been able to fix all the problems. One problem that I know still exists is selecting to display 'Date' in a layout. Doing this will reset the Treo 600 when you switch to that layout. As the second time page uses 'Date' in the default layout I recommend deleting BigClock from the Treo before installing this version. As I am not the author of this program and have no need to display 'Date' in a layout I won't attempt to fix this problem. This version of BigClock is completely unsupported. Use at your own risk. I will only make this version available as long as there is no update from Jens Rupp.
Updated Description:

NEW: The 'System' sound setting now uses the Calendar applications's alarm sound preference. This means that alarms now can play any of the ringtones. This version of BigClock is now for Treo 600 ONLY.