== Technical ==
See For general info on I/O Ports, see:* [[Standard Memory Expansions]]. === Bank Numbers === * 64K Expansion and 64K Silicon Disk use only one 64K bank (bank 0)* 256K Expansion uses eight 64K banks (bank 0..7)* 256K Silicon Disc uses eight 64K banks (bank 8..15)The 256K Expansion and 256K Silicon Disc can be used together, resulting in a total of 512K RAM in sixteen banks (bank 0..15). === Memory Expansion vs Silicon Disc === Both are basically the same hardware, both contain RAM, use same I/O ports, and both are not battery-backed.* The Memory Expansions are intended as general purpose RAM, and software is included on cassette or disc.* The Silicon Discs are intended as RAM Disc, software is included on ROM. The 256K version uses special bank numbers (see above). === Versions === * The 64K versions (of both Memory Expansion and Silicon Disk) were made only for CPC 464/664. On CPC 6128 they would be useless (replacing the 2nd internal 64K by external 64K).* The 256K versions (of both Memory Expansion and Silicon Disk) were made in separate versions for 464/664 and 6128 (they should be compatible at software side, possibly the differ only cosmetically...?)* All 64K/256K Memory Expansions, and the 64K Silicon Disc consist of a single cartridge. The 256K Silicon Disc is a special case: It consists of two cartridges shipped together (one contains the ROM, the other contains the RAM).
== Other Versions ==