A500+ vs. MaxiMem memory upgrade

[fafler]

I have a A500+ REV 8A with 8375 Agnus and a Amitech MaxiMem memory upgrade. Giving a total of 1.5 MB ChipRAM. The MaxiMem originally came with a Gary adapter allowing the the board to take up to 2 MB, but don't have that adapter. I have filled the board with 44256-7 chips, but i can't figure out how to make the Gary "see" the rest.

My SCSI controller provides up to 8 MB FastRAM, so i want to map 1 MB of ChipRAM to 100000h to 1FFFFFh (assuming the onboard RAM is mapped at 000000h 0FFFFFh) and, if it's possible, 1 MB in the C00000h - CFFFFFh area.

BTW. whats the memory at C00000h - D7FFFFh called? And what can it be used for?

[fafler]

The 1.5 MB ChipRAM i have now, is 1 MB onboard the A500+ and 0.5 MB on the expansion. I want to map 1 MB (or more, if possible) to ChipRAM. But if the C00000h area works works as FastRAM, you're right. It's not worth the effort.