The standard expansions are based on the RAM banking logic from the CPC6128, ie. equivalent to the fourth [[Gate Array]] register in the CPC6128 (or more precisely, the PAL that assists its Gate Array chip).
----
=== 64K Expansion (CPC6128-style) ===
* Accessing a 64K expansion (or the first 64K of a bigger expansion) is compatible to the 128K in the CPC6128
* For full CPC6128 compatibility one may need some patches (eg. CP/M Plus will still refuse to work; because it "detects" the 128K by checking the BASIC ROMs version number)
----
=== 128K-512K Expansions (dk'tronics/dobbertin-style) ===
'''Caution''' - The 64K bank numbers don't always start at bank 0 (In the Dk'tronics 256K Silicon Disc, the 64K banks are numbered 4..7).
----
=== 1M-4M Expansions (extended standard) ===