On top of what Lemmink wrote:
I suspect that this is the same A2500 which has the A2286-card in it ?
The PC-card will allocate a full 2MB piece of address-space, while only needing 128KB of it. Problem is that the Zorro-IO-space won't allow more than 64K per card, and the RAM-space can only be allocated in 2MB-chunks.
So 6MB fast (4 on A2630, 2 on the SCSI) and 1MB chip (on the mobo) is as far as you will get.
Unless ofcourse you replace the A2630 with something more modern :-P
