Your Hauppauge has 3 RCA video in ports and one S-Video input.
Always use the RCA plug next to the S-video connector.
This card is fully compliant with the PCI 2.1 standard.
The card supports NTSC/PAL/SECAM video decoding, complex video clipping of the video source and resolutions up to 768x576 (PAL).
Here is a functional diagram of your BT-878 video driver.