The Spectrum Show EP109, featuring a rather cool bit about the Interface II and a larger-capacity cartridge

[HEXdidnt]

While there are obviously SD card options like the DivMMC, this thing is a 4Mb Interface II cartridge which can be populated with 48K and 128K software via an Interface 1's serial port with an RS232 link to a PC, running a decent (if a little bare-bones) Windows interface. The cartridge then has its own user interface on the Speccy to load things up. Looks super-fast, and very adaptable.

Paul Farrow's website for the ZXC4 http://www.fruitcake.plus.com