* [[RAM7 2Mb memory expansion]] - is that 2Mbit or 2Mbyte? what I/O ports would be used to access 2MByte?
* [[Inicron RAM-Box]] - not fully compatible with standard expansions
* [[Data Media SP64]] - all unknown
* [[Dk'tronics Silicon Disc]] ([[Dk'tronics]]) - all unknown
* [[Phoenix M64]] - all unknown