• Interface that provides monochrome video signal and RGB vide signal.
• It was sold to connect the ZX Spectrum to a monitor Ferguson, which provides +12 volts required by the interface (the monochrome video signal works without +12 v).
  

Modifications

    To use this interface with other RGB monitors / tv, 2 modifications are necessary

• It is necessary to invert the sync signal (If monitor don't support inverted sync).
• It is necessary to provide +12 v to pin input connector 8 DIM. Some possible solutions are:
• You can use an +12 V external source .
• You can use the Spectrum power supply (+9 v signal is present in the expansion bus). The original power supply usually give about 11-13v when it's connected to a 48k Spectrum.