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The pictures are showing the RGB outputs on a CPC6128 with classic (non-cost-down) mainboard (measured between the monitor connector and R126,R128,R130). Each divider is 500us / 100mVin height.
The CPC is connected to the RGB input of a Philips Philetta TV Set (this is important for the test, as the monitor does pull-down the signals, without monitor connected both "max" and "half" signals are around 4.0V, with monitor connected they drop to circa 1.0V and 0.5V, as seen in the pictures).