Extra Memory for 3DS
24-Jun-93 08:48:05
Sb: #47322-Extra Memory for 3DS
Fm: David Rhoten 71450,2654
To: Larry Minton 74010,3076
Larry — I think the origin of this message is in the question of adding a
16-bit memory board to a 32-bit system, after having topped out it's 32-bit
memory slots. Right?
If so, I believe that while QEMM can sort memory by speed, it more has to do
with refresh, because (and I'm sure I'll be corrected by someone if I'm wrong)
adding a 16-bit board will add wait-states to the overall memory access, and
there's nothing QEMM can do about that. The fact is that the 16-bit memory
will take _a lot_ longer to access, and the CPU can't just selectively say,
"Oh, that information is in the slow RAM, so I'll just sit on my hands for a
couple cycles" or "that info is in the fast RAM, so I'll just take it and run."
It will just treat it all the same.
Dave