More than 128 mB on a CSPPC?

[psxphill]

I believe the biggest problem with more ram on a CSPPC or MKIII is the fast slot on A3000 and A4000 can only address 128mb of ram.  I don't think there are physically more address lines that can be used to allow the A3000/A4000 to access more than 128MB even with 060 on the CPU card.

According to this, the slot has all address lines.

http://www.thule.no/haynie/systems/amiga3k/docs/a3kcpu.pdf

Local bus slot memory doesn't use autoconfig and only 128mb was reserved, however I'm sure it would have been possible to have worked round that if that hadn't seemed like a ridiculous amount of memory when the cpu cards were designed. If I were designing an accelerator today then I'd have 4gb of ram soldered to it and then have the rom on the cpu card wait until everything else had been autoconfig'ed and then map all the unused address space as ram.

[psxphill]

I still think patching the KS will be needed to support more than 128mb of ram on that bus.  From reading posts on the zorram and DKB and other large Z3 memeory expansions, there are a lot of bugs in expansion.library that will require fixing to make things happen easily.

expansion.library wouldn't be necessary as I don't think you can autoconfig from the local bus, a resident module in rom that adds memory to exec directly would probably do it. Or you could add the extra memory in a command called from user-startup.