I have an 500+ rev8A, I added the missing 0.5 MB RAM and the U32 to the motherboard. I also have 512 KB in the trapdoor. This results in 1.5 MB chip RAM; but I want to have 1 MB chip RAM and 0.5 MB slow RAM.
How can I arrange for this? That is, for the expansion to be used as slow RAM? What are the right jumper settings (JP2, JP3, JP4A, JP4B, JP7A — no U32) for this configuration?