It's sitting on top of an old IBM XT 8088 CPU.
What's with it being black? Bizarre. Especially if they wanted it to be recognizable as an Amiga (as mentioned in the dialogue).
Looks like whoever designed that prop had some Amiga experience, because the "interface" they designed to load the games is either actually running on Workbench, or is a mock-up animation that looks pretty good.
