checking memory in my 2000xl --- beginner question.

how can i check how much RAM is in my MPC 2000XL....just bought it used. took a peek around here and google'd, but couldn't see a solution. any direction would be appreciated - not sure if i have to open it up or not.

go to the "sample" screen and press open window, it will show a bar with how much you got and how much is used