* 64K Expansion and 64K Silicon Disk use only one 64K bank (bank 0)
* 256K Expansion uses eight four 64K banks (bank 0..73)* 256K Silicon Disc uses eight four 64K banks (bank 84..157)The 256K Expansion and 256K Silicon Disc can be used together, resulting in 512K RAM in sixteen eight banks (bank 0..157). Plus, the 64K internal RAM is used (so total RAM is 576K).
=== Memory Expansion vs Silicon Disc ===