So... I got to thinking about what the manufacturer/specs claim is the largest ram module for a certain machine, and the fact that there are often larger ram modules with the same pins.
Take, for example, the SE/30. Apple says the 4MB SiMMs are the largest it will take... but someone — and I really wish we could get that story — found out that it takes 16MB SIMMs, substantially raising the maximum ram of the machine from 32MB to 128MB. (Are there other examples of this?)
So... just how does one go about discovering the maximum sized ram stick that a machine will actually take? Is there a way to tell before hand that the Mac Mini, for example, just won't work with a 2GB chip? Can someone say for sure that there is no way 4 X 128MB 72-pin SIMMs could possibly work in a Quadra 650? Or 256MB sticks in a B&W?
I guess what I'm asking is... what causes the limits of the maximum ram chip a computer can use, even though there are larger ram chips available in that chip configuration?