How can one add more memory than 128MB to a A4000 Cyberstorm PPC

[alexh]

You cannot. 128Mbytes is the maximum the CSPPC can take.

If you need more RAM the only option is to buy a Zorro board with memory such as a DKB3128, Fastlane etc.

[alexh]

There is no DMA on most PCI bus boards between the host CPU and PCI and so if there were any RAM cards they (AFAIK) would not be supported.

Plus all most PCI RAM cards use DIMMS and the are not RAM but virtual RAM drives.

[alexh]

You cannot get a PCI card which takes SIMMS
You cannot get a busboard which takes SIMMS

All you can get is a DKB3128 which can take 8 * 16Mbyte 72-pin SIMMS (128Mbytes) or a Fastlane which can take 16 * 4MB 30-pin SIMMS (64Mbytes)

[alexh]

Painkiller wrote:
What PCI memory cards are there that work with A4000 as a memory expansion

None.

Painkiller wrote:
What busboards can take 4x128MB 72pin SIMMs?

None.

[alexh]

mongo wrote:

alexh wrote:
There is no DMA on most PCI bus boards between the host CPU and PCI

There is no DMA between the host CPU and anything.

You are of course right. I am thinking about a different issue which is that non of the PCI bridge boards are Zorro III DMA masters, which has nothing to do with RAM.

[alexh]

Vlabguy1 wrote:
mmm..can someone make a PCI memory card..

$2k and it's yours.