Syncros 89 or USE ti 89 advice

[2manyoranges]

Re:

THanks Roc ... have been through the old thread, which is exceptionally comprehensive and useful - lovely to have such detailed reference points - and the early one I have is def series 1. I have a later one too, but the one we dug out at the weekend is a series 1 425mm small logo model....lost and found....