perfect addition to our interfaces:
If you want to use two interfaces on your Spectrum, but you have only one Expansion-Port, here is the solution. Two expansion ports on the rear of your Spectrum. You can even expand further by adding more ZX-EXT port doubler. But please be aware, too long extensions of the expansion port can cause timing problems. Also you cannot use interfaces that use the same port adresses at the same time, such as different disk-interfaces. Perfect is the usage in combination of disk-interface (or IDE interface such as Divide or DivMMC) and Joystick-Interfaces, Sound-Interfaces or our ZX-VGA Interface.