Chapter 3
17
SCART connection
The SCART socket provided by the SPECTRA interface connects to a television using
a standard SCART cable. It outputs a RGB signal to produce a high quality picture,
and allows the Spectrum’s sound to be played through the television’s speaker(s). It
also provides the necessary control voltages required to instruct the television to
automatically select the RGB signal of the SCART socket.
The majority of commercially available SCART cables will be suitable. Alternatively, it is
possible to construct your own lead. The diagram below shows the pin-out of the
SCART socket provided by the SPECTRA interface.
Front view of the SPECTRA SCART socket
The wiring of a SCART cable suitable for use with the SPECTRA interface is shown on
the next page, and results in a cable that can be connected either way round. The
ground connections (pins 4, 5, 9, 13, 17 and 18) may be wired individually pin-to-pin
between the SCART plugs, or they may all be tied together and linked using a single
connection. The cable should be screened to minimise interference.
Modern televisions typically perform processing on an incoming signal to try to
improve the quality of the displayed picture, e.g. sharpening, motion smoothing, etc.
However, such processing may actually result in a worse picture from the Spectrum
and so it may prove beneficial to disable all such filters.
To enable sound output via the television’s speaker(s), configuration switch 1 must be
set to the on position.
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