== 4MB RAM expansions ==
Beware about 4MB RAM expansions. The upper 2MB (Port 7Bxxh, 7Axxh, 79xxh, 78xxh) of a 4MB RAM expansion can conflict with other hardware as setting A10 to 0 is also used for many hardware expansions.
The practical safe maximum on Amstrad CPC with [[Standard Memory Expansions]] is 2MB.