Sony TVP-08 Training Manual page 75

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to IC511/33 HP In and IC511/32 VBLK. These signals are used to phase
lock the sync of the deflection circuits output to the output of the sync
signals from IC511 Video Processor. In addition to this, the HBLK signal
is applied to an OR circuit, along with the VBLK and HS Out signals to the
SCP pulse. The SCP is called the sand castle pulse because of its shape.
The SCP pulse input to IC511/31 is used to time the clamping of the video
signal.