Hahaha, I'm sorry, but I think it's no use asking me that. I've been using ROM SIMMs since the beginning, so I haven't tried that. Perhaps the stored data 0,1,2,3 usually fits from U4, U3, U2, U1 but I think it fits from U1, U2, U3, U4 and vice versa.
But it would be confusing if I had to do...