PPC / 680x0 development help!

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itix wrote:

Does anyone have any idea how Phase5 connected the PPC chips to the 68000 bus on the PPC accelerators?

I guess everything related to Phase5 PPC cards is kept secret.

basicly i'm trying to figure out how to create a PPC only accelerator card

Custom made PPC accelerator sounds like a dead idea for me...

The 68k bus is not good for running a PPC.. Imagine having a G3 plugged (via an adptor) into a 68K socket... Even if you had a huge amount of L2 SRAM cache  on the adaptor it would still be wading through syrup... not to mention the need for some firmware on the adaptor to boot the PPC and maybe start a 68k emulator so the Amiga could boot.

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plus the other issue, is having the PPC accessable at the same time (warpup / powerup) and hopefully to run OS4, all its going to require is a firmware rewrite / flash, or given the current prices of flash ram, have both sets of code in there.

WarpOS/PowerUP issue is dead. At the end of the day there is no point trying to hack that solution again.

You would be far more wise to have the PPC run a simple 68K emulator to boot the Amiga, then then load OS4 or MOS (or AROS :-D ) and then forget about your 68K emulator, and let the OS's do their work.