Wow, cool computer history. I guess you're leading the group by being the guy that jumped on the train at first ;-)
I remember to have learned a bit Pascal in school und we used a Pascal-Compiler on an Apple IIc.
I also remember this SX-64. I wanted one desperately, when I saw it in the mall. Never managed to get one, but my old C-64 is still with me.
Thanks for sharing your story!