* 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). Plus, the 64K internal RAM is used (so total is 576K).
=== Memory Expansion vs Silicon Disc ===