Stuff thats not completely compatible

[rhino]

AIUI the memory limit on the Cyberstorm (and all other accelerators using that slot) is due to the design of the A3000/4000 CPU slot which can only address 128Mb.

I suppose at the time the A3000 was being designed (the first Amiga to have that slot design) 128Mb seemed like a huge amount and would have cost several thousand dollars. As a reference I remember when I got my A4000 in '94 4Mb SIMMs were over 200UKP each:)

Robert

[rhino]

@Kronos

My hardware knowledge is very limited but I'm not aware of any CPU slot accelerator that could accept more than 128Mb (of course that doesn't mean it's not possible).

I thought that in the A3000/4000 (unlike the A2000 which is a 16bit machine) the rest of the address space was already allocated for Zorro III cards.

If anyone is interested here are some documents from Dave Haynie on the A3000 design:

An overview which mentions the address limit.
The CPU slot specification.

Robert

[rhino]

@Kronos

I see what you mean, I hadn't considered the CVision PPC and GRex.

I think its safe to say that any additional memory installed on a CPU slot accelerator could not be contiguous with the first 128Mb block, even if it is possible to make a card which supports it.

Presumably the CSPPC expansions must map either into the Zorro III space (if that's possible) or above 2Gb. I don't understand this enough to make any further comments.

Where's a hardware engineer when you need one

Robert