* The same plastic case is used by the Spectrum version of this interface.
* The spectrum version has two switches on the top. One of which chooses load/save. In the Amstrad these holes are filled with plastic caps.
Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page :
http://trastero.speccy.org/cosas/JL/JL.htm
We can know more about this hardware.
== Pictures ==