Thank you for your reply. I have been googling for an answer on the 8052's voltage, but I seem to be search deficient at the moment. I can't seem to find a proper data sheet for a chip that was used for over a decade...I'll keep looking.
The typewriter is a Smith Corona SL 470. It is powered by an Intel 8052.
As for pictures, someone made a blog entry about starting this project (2 years with no updates) and they included some decent pics of the inside. You can see it here: