Technical Question regarding beginning address for FAST Ram on 68k (A500)

[Doobrey]

According to the A500 memory map,
 $200000-$9FFFFF Space for AutoConfig memory

But, the actual start address depends on the type of expansion card!
 If done properly, it should use autoconfig to allocate some space in this area, so it could be anywhere in this range,depending on what else is plugged into the Amiga.
 
 There is no bank swapping, just simple decoding of the address lines, the expansion has it`s own ram controller to handle the rest.
 BTW, it`s A0-23 ..24bit wide address bus, 16bit data bus

[Doobrey]

It depends..there is/was something called the MegaMiniChip (and a few variants) that gave the A500 &A2000 2Mb of chip ram by replacing the old 1mb agnus and adding another 1mb of ram.
 Without this, you get the 9mb limit you mentioned.

Then there`s the "Ranger" mem, which I think is about 2.5 mb too.. meaning you could max out an a500 to 12.5 mb of ram. :-)