This type of question will get a better response on airliners.net. But you need to be more specific with the dates. For instance, in Perth between 1996 and 2000 SQ operated the A340-300, A310-300, 777-200 and possibly the 747-300 (don't think it saw the 744). If you can tell me the year (and pref month) I will check with a plane geek I know from PER who should be able to help.

Dubai was likely the A310-300 but that's really nothing more than an 'informed guess'

Abu Dhabi - I wasn't even aware SQ flew there in the late 1990s. A quick look at a timetable for 1993 shows no service, and I know they started up the current route in about 2006/07. Perhaps SQ started and stopped AUH between 1993 and 2000.

Anyway, like I said, try airliners.net -- there are geeks a plenty who will be all over this.

Cheers