I recently purchased a 1221ec and have no problem inserting it into my first A1200, and it works fine.
However, with my second A1200 the 1221ec can't slot onto A1200 trapdoor edge connector properly - it can't slide all the way down.
I've used a 8mb ram card on both A1200s with no issue.
Does anyone know of any problems with the A1200 edge connectors? Were there any small variations in their sizes, enough to create a problem with the 1221?