CyberstormPPC and more than 128MB RAM

[Ancalimon]

Would it be possible to modify the flash of CstormPPC to make it support two 128MB SIMMS connected and seen as 256MB?

[Piru]

No

[gdanko]

This begs the question. Where is the limitation? Is the Amiga hardware the limiter? Or is it the CSPPC card itself? And if it is the CSPPC, why is it not possible to alter the limit to 256?

[Ancalimon]

Piru wrote:
No

So we would need a hardware modification.

Anyone figured it out yet?

[Piru]

The 128MB limit is the limitation of the A3000/A4000 CPU Slot.

[gdanko]

Ah that would explain why devices like the Fastlane Z3 could go up to 256m, right?

[Piru]

Fastline Z3 doesn't connect to the CPU slot, does it?

Anyway, as far as I can tell there is no way to have more than 128MB thru the CPU slot, at least if you intend to have DMA access to the memory.

[gdanko]

That's what I was alluding to, smartass.

[derringer3]

But bppc can hanle 256Mb ram, so the little 1200 has better expansion port?

And my opinion: if you want to use os4 (or mos pup) 128Mb is for nothing. You can't even use origyn for example.

[Zac67]

Piru wrote:
The 128MB limit is the limitation of the A3000/A4000 CPU Slot.

How can the fast slot limit the memory that lives completely on the CPU card? As long as the RAM controller and the CPU can access the RAM, I'd venture there's no limit (apart from possibly Autoconfig).

[itix]

But bppc can hanle 256Mb ram, so the little 1200 has better expansion port?

I would even dare to say that A1200 is superior to A4000.

[arnljot]

http://amigahardware.mariomisic.de/cgi-bin/showhardware_en.cgi?HARDID=228

GVP Trex040:
Max Ram: Unknown but probably 64MB without RAM board and 256MB with RAM board.

This is wrong then?

[A6000]

Piru wrote:
The 128MB limit is the limitation of the A3000/A4000 CPU Slot.

A cpu card can be designed with as much memory as the designer chooses, but only 128mb will be accessible to the DMA controller on the motherboard. A new card would probably have it's own DMA controller to address the full memory on board.

The zorro bus is, I think, limited to 1.75GB ram, so amigaos probably cannot manage more than 2GB ram.

[Oli_hd]

Piru is right, the A3/4K fast slot has a ram chip select generated by the motherboard, this chip select is for a 128meg window, you can not add more than that without adding a full on autoconfig system to the board.

The A1200 doesnt have a ram chip select on its trapdoor slot so they have to autoconfig it. (they have the Autoconfig signals so its just like a zorro slot)
Zorro 3 has autoconfig so it can specify larger sizes or let the OS size it so thats fine.

You can not add more than 128 meg of ram to any fast slot CPU card that uses the ram chip select generated by the board and I know of no card that autoconfigs the ram.

So tadaaa.
if you want more ram make a Z3 board.. and Piru knows what he is talking about.  :-)

edit:

GVP Trex040:  Max Ram: Unknown but probably 64MB without RAM board and 256MB with RAM board.      This is wrong then?

Wasnt the biggest 64pin simm only 16meg? cause that would make 128meg max ram and tadaa.

Oh and just checked, Amiga Resource says its for 4 or 16meg simms

[Piru]

@Zac67

How can the fast slot limit the memory that lives completely on the CPU card?

It doesn't.

It'd suck to have no DMA to this memory. Granted any on board HW could obviously have DMA, but Zorro would be out.

The question was if CSPPC could be made to have more than 128MB. It can't.