@Piru
Interesting. Obviously, with MAPROM, one copy of the expansion.library would be in fast ram. If that copy were used then what program would map it into the lower memory address? The MAPROM code? The AmigaOS doesn't touch the MMU as far as I know. You would probably know if BlizKick did it. I wouldn't think there would be any need to do so by the time the 680x0.library starts. Maybe the address is in the ROM and not chip ram. I'll have to have a look at the address again. If the expansion.library in the ROM is always used then maybe the expansion.library would be unnecessary in the MAPROM kickstart. I'll have to do some investigating.