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It is probably that the Z2 mediator window lost focus. If you set it to 8MB on a TX 4MB stays on the gfx card and the other 4MB switches around to bank into PCI space. With a Radeon, there is much more memory to cover. Maybe with a Voodoo it works better.
If you set it to 4MB, 4MB is reserved for PCMCIA and the other 4MB needs to switch around to bank into PCI memory, including gfx memory and dma memory.
Maybe MMU=on helps?
This is the reason why the PCI PPC cards don't work on A1200 mediators.
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