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The demodulated composite video signal is available at pin 38 and then buffered by
transistor 7201.
Video source selection
The Composite Video Blanking Signal (CVBS) from buffer 7201 goes to the audio
carrier trap filters (1200, 1201,or 1202 depending on the system used) to remove the
audio signal. The signal then goes to pin 40 of IC 7200. The internal input switch selects
the following input signals:
Pin 40: terrestrial CVBS input
Pin 42: external AV1 CVBS input
Pin 44: external Side I/O CVBS or AV2Luminance (Y) input
Pin 45: external AV2 Chrominance (C) input
Figure:
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