Yip mine has the trip computer, graphic equalizer although this has been removed as mines has a clifford alarm and some of the controls are now in the place where the graphic equalizer used to be. It probably would have had the upgraded speakers however my car has had a full new sound system fitted to it with new front speakers and 2 tweeters. There is a huge bass unit in the boot and professionally fitted. The guy who did the sound system work got this done in 1998 and from the receipts I have it cost £800 for the sound system. It also has the RS 3 spoke leather steering wheel but I've seen pics of other S2's and they have the standard crappy looking normal steering wheel it. Did the S2 90 spec models have a different steering wheel from the earlier S2's?
I don't even know how to check if there is a rear roll bar on my Series 2 just don't know what I'm looking for Embarrasing your probably thinking for a guy like me who loves S2's and I should probably know more about them than I do but that's why I'm on here to learn. I work in the IT profession so I dont tinker with motors during the day and stuff.