This was a huge pain. The 1MB unit doesn't seem to be upgradeable with the Atari 4MB card; perhaps a third party one? I got it in there but I had to cut the metal shield which was its own adventure.
oldvcr.blogspot.com
Refurb weekend: Atari Stacy
Ask any Atari Stacy owner how to open an Atari Stacy and the answer is always "never, if you can avoid it." So I'll just lead with this spoi...
oldvcr.blogspot.com